Mass Comparators

New generation of Ohaus portable scales These balances are ideal for laboratory and industrial appli (more)cations. They feature an easy to navigate color touchscreen display and a compact design that allows for storage. They offer excellent performance with fast stabilization times and high resolution results. They also feature excellent overload protection and advanced connection options. - Fast and efficient navigation thanks to the color touchscreen display - High weighing speed and high resolution display of repeatable and reliable results - Excellent overload protection - Different application modes and operation in various languages ​​for simplified weighing The OHAUS Scout scale can be equipped with various connectivity options: RS232, USB, USB device, Ethernet or Bluetooth®. These options guarantee a modern and smart experience, increase the versatility of data collection and transfer functions. Other standard features and equipment Transport lock, stainless steel weighing pan, menu and setting lock switch, adjustable and non-slip feet, bubble level, software and mechanical overload/underload protection, stability indicator, automatic tare, level indicator low battery, auto power off, user selectable print options and communication settings. Applications Weighing: Determines the weight of the items on the pan in the selected unit of measure. Piece Counting: Count the number of pieces on the pan using a uniform weight. Percent Weighing: Measures the weight of a sample displayed as a percentage of a pre-set reference weight. Check Weighing: Compares the weight of a sample against target limits. Dynamic Weighing: Weigh an unstable sample load. The balance takes an average of weights over a period of time. Totalization: Measures the cumulative weight of multiple items. Cumulative total may exceed balance capacity. Density Determination: Determines the density of solids or liquids. With the integrated weigh below hook, specific gravity tests can be performed for items that cannot easily be placed on the weighing pan. Display Hold: Manually holds the last stable weight or the first highest stable weight value on the display. Mole Weighing: Measures the weight of a sample and automatically calculates it into the mole. MODELS AVAILABLE: Applications Weighing, Parts Counting, Percent Weighing, Check Weighing, Animal/Dynamic Weighing, Totalization, Density Determination, Display Hold, Molar Weighing Display 4.3' (109mm) touchscreen display with color VGA graphics resolution and user controllable brightness Operation Power supply (adapter supplied) or batteries (not supplied) with low battery level indicator and programmable automatic shutdown Communication RS232, USB host, USB device, Ethernet or Bluetooth® (available as accessories) Framework ABS housing, stainless steel pan, ABS draft shield (1 mg models only), weigh below hook, transport lock, manual calibration lock switch, security slot, stabilizing feet, level indicator illuminated front Construction features Stability indicator, stackable design with included storage cover (except 1mg models), mechanical and software overload and underload protection, battery life indicator, auto power off, auto tare, calibration weight provided in models with capacity greater than 620 gr. THE TOUCHSCREEN DISPLAY Using portable scales has never been easier! The color touchscreen display allows you to explore the interface and icon menu, open and close application modes, change units of measure with a single touch of the screen. In seconds, an unmatched level of portable weighing efficiency and functionality. In addition, GLP/GMP traceability makes it easier to monitor and report data.

The newest line of Radwag Mass Comparators enables adjusting mass standards and weights according to (more) the OIML recommendations (R-111) for M1 class and lower. The comparators are used both for ensuring traceability of mass measurements, and verification of weights in accordance with legal metrology. RADWAG Mass Comparators have gained recognition among Accredited Calibration Laboratories, in many countries. HRP 5Y.KB series comparators comprise two components, professional weighing platform (a new mechanical design of electromagnetic mechanism housed within a tight steel casing) and 5Y terminal. The weighing platform made of steel features centring rings enabling precise positioning of the weights. The comparator features intuitive and user friendly menu.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator can be equipped with a self-centring weighing pan (extra charge), which significantly minimises the influence of eccentricity during measurements. The self-centring weighing pan eliminates the error of placing the weight "out of pan centre". This solution also enables calibrating weights of different shapes and dimensions without the need to set the positioners for central loading of the mass standard each time. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator can be equipped with a self-centring weighing pan (extra charge), which significantly minimises the influence of eccentricity during measurements. The self-centring weighing pan eliminates the error of placing the weight "out of pan centre". This solution also enables calibrating weights of different shapes and dimensions without the need to set the positioners for central loading of the mass standard each time. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator can be equipped with a self-centring weighing pan (extra charge), which significantly minimises the influence of eccentricity during measurements. The self-centring weighing pan eliminates the error of placing the weight "out of pan centre". This solution also enables calibrating weights of different shapes and dimensions without the need to set the positioners for central loading of the mass standard each time. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator can be equipped with a self-centring weighing pan (extra charge), which significantly minimises the influence of eccentricity during measurements. The self-centring weighing pan eliminates the error of placing the weight "out of pan centre". This solution also enables calibrating weights of different shapes and dimensions without the need to set the positioners for central loading of the mass standard each time. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator can be equipped with a self-centring weighing pan (extra charge), which significantly minimises the influence of eccentricity during measurements. The self-centring weighing pan eliminates the error of placing the weight "out of pan centre". This solution also enables calibrating weights of different shapes and dimensions without the need to set the positioners for central loading of the mass standard each time. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

The HRP 5Y.KO series of mass comparators enables calibrating mass standards and weights in accordanc (more)e with OIML Recommendation (R-111) for class F2 and lower classes. Comparators are used to ensure consistency in mass measurements as well as to verify weights according to legal metrology requirements. RADWAG mass comparators have been recognized by calibration laboratories in many countries. The HRP 5Y.KO mass comparators consist of two elements: a professional weighing platform (modern design of an electromagnetic mechanism in a hermetic steel casing) and 5Y terminal. The weighing platform is made of steel and features marks facilitating centric loading of mass standards. The comparator can be equipped with a self-centring weighing pan (extra charge), which significantly minimises the influence of eccentricity during measurements. The self-centring weighing pan eliminates the error of placing the weight "out of pan centre". This solution also enables calibrating weights of different shapes and dimensions without the need to set the positioners for central loading of the mass standard each time. The comparator has a user-friendly menu. Data security and work results archiving are ensured by RADWAG terminal software.

RS 232 cable: scale (15-pin connector) – computer (9-pin connector). Cable length: 5 m. Custom (more)ized cable length (extra charge): 2 m, 10 m.

RS 232 cable: scale (15-pin connector) – computer (9-pin connector). Cable length: 2 m. Custom (more)ized cable length (extra charge): 5 m, 10 m.

RS 232 cable: scale (15-pin connector) – computer (9-pin connector). Cable length: 10 m. Custo (more)mized cable length (extra charge): 2 m, 5 m.

IN/OUT cable (PUE C41H, PUE HY10, PUE 5.15, PUE 5.19). Lenght 5 m. Cable types: Standard P0256.2: 2  (more)m Customized P0256.5 (extra charge): 5 m Customized P0256.10 (extra charge): 10 m Compatible with: Scales operated via PUE C41H terminal Scales operated via PUE HY10 terminal Scales operated via PUE 5.15 terminal Scales operated via PUE 5.19 terminal PUE C41H terminal PUE HY10 terminal PUE 5.15 terminal PUE 5.19 terminal HRP platform MWSH weighing module MWLH weighing module

IN/OUT cable (PUE C41H, PUE HY10, PUE 5.15, PUE 5.19). Lenght 2 m. Cable types: Standard P0256.2: 2  (more)m Customized P0256.5 (extra charge): 5 m Customized P0256.10 (extra charge): 10 m Compatible with: Scales operated via PUE C41H terminal Scales operated via PUE HY10 terminal Scales operated via PUE 5.15 terminal Scales operated via PUE 5.19 terminal PUE C41H terminal PUE HY10 terminal PUE 5.15 terminal PUE 5.19 terminal HRP platform MWSH weighing module MWLH weighing module

IN/OUT cable (PUE C41H, PUE HY10, PUE 5.15, PUE 5.19). Cable types: Standard P0256.2: 2 m Customized (more) P0256.5 (extra charge): 5 m Customized P0256.10 (extra charge): 10 m Compatible with: Scales operated via PUE C41H terminal Scales operated via PUE HY10 terminal Scales operated via PUE 5.15 terminal Scales operated via PUE 5.19 terminal PUE C41H terminal PUE HY10 terminal PUE 5.15 terminal PUE 5.19 terminal HRP platform MWSH weighing module MWLH weighing module

4 IN / 4 OUT cable (PUE 7.1). Standard cable length: 3 m Compatible with: Scales operated via PUE 7. (more)1 terminal PUE 7.1 terminal

RADWAG-manufactured AVK-1000 automatic vacuum mass comparator is intended for national metrological  (more)institutes that transfer and maintain the national reference mass standard of 1 kg. The comparator is intended for weighing mass standards and silicone spheres of 100 mm diameter. It enables comparison of up to 6 prototypes of max 1kg mass. The repeatability of the process is of 0.3 µg and readability of d = 0.1 µg. A specially designed vacuum chamber enables carrying out measurements in a vacuum of 10-6 mbar capacity or in atmosphere containing noble gases. AVK-1000 is equipped with suspended weighing pan that eliminates eccentricity errors. Standard version of the mass comparator features thermo-hygro-barometer for testing ambient conditions with great accuracy: pressure of 0.001hPa, humidity of 0.01% and temperature of 0.001 °C. The comparator is also equipped with high quality vacuum gauge. The AVK-1000 vacuum mass comparator can be equipped with the LOAD LOCK system for carrying mass standards. The system enables switching or adding artefacts without changing the atmosphere inside the main chamber. With the use of a special chamber for mass standards switching the whole process is 90% shorter. During mass standards replacement carried out without the use of the LOAD LOCK system, the air enters the main chamber of the mass comparator. After each opening of the chamber it is necessary to pump the air out in order to obtain required vacuum value. The vacuum mass comparator needs approx. 48 hours in order to obtain vacuum that ensures measurement repeatability. The LOAD LOCK is equipped with a high-efficiency pump system, the time of pumping the air out in order to enable opening of the valve of the main chamber is significantly shortened. The stabilization of the main chamber after replacing/adding the mass standard and closing the valve connecting the main chamber and the LOAD LOCK system takes 5 hours. The high-quality vacuum gauges enable monitoring and comparing the vacuum value in order to determine the moment when opening the valve again and replacing the mass standard is available. A specially designed viewfinder enables monitoring of the process. The LOAD LOCK enables switching objects of dimensions adapted to the AVK-1000 mass comparator: cylindrical mass standards of 22-95 mm diameter and silicone spheres of 40-100 mm diameter. Supplementing the AVK-1000 vacuum mass comparator with LOAD LOCK system significantly improves the comparison performance.

RADWAG-manufactured AVK-1000 automatic vacuum mass comparator is intended for national metrological  (more)institutes that transfer and maintain the national reference mass standard of 1 kg. The comparator is intended for weighing mass standards and silicone spheres of 100 mm diameter. It enables comparison of up to 6 prototypes of max 1kg mass. The repeatability of the process is of 0.3 µg and readability of d = 0.1 µg. A specially designed vacuum chamber enables carrying out measurements in a vacuum of 10-6 mbar capacity or in atmosphere containing noble gases. AVK-1000 is equipped with suspended weighing pan that eliminates eccentricity errors. Standard version of the mass comparator features thermo-hygro-barometer for testing ambient conditions with great accuracy: pressure of 0.001hPa, humidity of 0.01% and temperature of 0.001 °C. The comparator is also equipped with high quality vacuum gauge. The AVK-1000 vacuum mass comparator can be equipped with the LOAD LOCK system for carrying mass standards. The system enables switching or adding artefacts without changing the atmosphere inside the main chamber. With the use of a special chamber for mass standards switching the whole process is 90% shorter. During mass standards replacement carried out without the use of the LOAD LOCK system, the air enters the main chamber of the mass comparator. After each opening of the chamber it is necessary to pump the air out in order to obtain required vacuum value. The vacuum mass comparator needs approx. 48 hours in order to obtain vacuum that ensures measurement repeatability. The LOAD LOCK is equipped with a high-efficiency pump system, the time of pumping the air out in order to enable opening of the valve of the main chamber is significantly shortened. The stabilization of the main chamber after replacing/adding the mass standard and closing the valve connecting the main chamber and the LOAD LOCK system takes 5 hours. The high-quality vacuum gauges enable monitoring and comparing the vacuum value in order to determine the moment when opening the valve again and replacing the mass standard is available. A specially designed viewfinder enables monitoring of the process. The LOAD LOCK enables switching objects of dimensions adapted to the AVK-1000 mass comparator: cylindrical mass standards of 22-95 mm diameter and silicone spheres of 40-100 mm diameter. Supplementing the AVK-1000 vacuum mass comparator with LOAD LOCK system significantly improves the comparison performance.

RADWAG-manufactured AVK-1000 automatic vacuum mass comparator is intended for national metrological  (more)institutes that transfer and maintain the national reference mass standard of 1 kg. The comparator is intended for weighing mass standards and silicone spheres of 100 mm diameter. It enables comparison of up to 6 prototypes of max 1kg mass. The repeatability of the process is of 0.3 µg and readability of d = 0.1 µg. A specially designed vacuum chamber enables carrying out measurements in a vacuum of 10-6 mbar capacity or in atmosphere containing noble gases. AVK-1000 is equipped with suspended weighing pan that eliminates eccentricity errors. Standard version of the mass comparator features thermo-hygro-barometer for testing ambient conditions with great accuracy: pressure of 0.001hPa, humidity of 0.01% and temperature of 0.001 °C. The comparator is also equipped with high quality vacuum gauge. The AVK-1000 vacuum mass comparator can be equipped with the LOAD LOCK system for carrying mass standards. The system enables switching or adding artefacts without changing the atmosphere inside the main chamber. With the use of a special chamber for mass standards switching the whole process is 90% shorter. During mass standards replacement carried out without the use of the LOAD LOCK system, the air enters the main chamber of the mass comparator. After each opening of the chamber it is necessary to pump the air out in order to obtain required vacuum value. The vacuum mass comparator needs approx. 48 hours in order to obtain vacuum that ensures measurement repeatability. The LOAD LOCK is equipped with a high-efficiency pump system, the time of pumping the air out in order to enable opening of the valve of the main chamber is significantly shortened. The stabilization of the main chamber after replacing/adding the mass standard and closing the valve connecting the main chamber and the LOAD LOCK system takes 5 hours. The high-quality vacuum gauges enable monitoring and comparing the vacuum value in order to determine the moment when opening the valve again and replacing the mass standard is available. A specially designed viewfinder enables monitoring of the process. The LOAD LOCK enables switching objects of dimensions adapted to the AVK-1000 mass comparator: cylindrical mass standards of 22-95 mm diameter and silicone spheres of 40-100 mm diameter. Supplementing the AVK-1000 vacuum mass comparator with LOAD LOCK system significantly improves the comparison performance.

The newest line of Radwag Mass Comparators enables adjusting mass standards and weights according to (more) the OIML recommendations (R-111) from 5 kg to 20kg for E1 class and lower. Mass comparators are used both for ensuring traceability of mass measurements, and verification of weights in accordance with the principles of legal metrology. RADWAG Mass Comparators have gained recognition among Accredited Calibration Laboratories in many countries. Mass comparator APP 5Y.KO series comprises two components. One of them holds the electronic module, and the other precise mechanical measuring system. High measuring accuracy is guaranteed by semi-automatic adjustment system with external mass standard. The weighing pan made of aluminium is covered with cork layer and features centering holders for the weights. The APP 5Y.KO series features an intuitive menu supporting a user in instrument operation. Correct operation of the mass comparator requires applying a special anti-draft shield which comes standard with the instrument.

The newest line of Radwag Mass Comparators enables adjusting mass standards and weights according to (more) the OIML recommendations (R-111) from 5 kg to 20kg for E1 class and lower. Mass comparators are used both for ensuring traceability of mass measurements, and verification of weights in accordance with the principles of legal metrology. RADWAG Mass Comparators have gained recognition among Accredited Calibration Laboratories in many countries. Mass comparator APP 5Y.KO series comprises two components. One of them holds the electronic module, and the other precise mechanical measuring system. High measuring accuracy is guaranteed by semi-automatic adjustment system with external mass standard. The weighing pan made of aluminium is covered with cork layer and features centering holders for the weights. The APP 5Y.KO series features an intuitive menu supporting a user in instrument operation. Correct operation of the mass comparator requires applying a special anti-draft shield which comes standard with the instrument.

The newest line of Radwag Mass Comparators enables adjusting mass standards and weights according to (more) the OIML recommendations (R-111) from 5 kg to 20kg for E1 class and lower. Mass comparators are used both for ensuring traceability of mass measurements, and verification of weights in accordance with the principles of legal metrology. RADWAG Mass Comparators have gained recognition among Accredited Calibration Laboratories in many countries. Mass comparator APP 5Y.KO series comprises two components. One of them holds the electronic module, and the other precise mechanical measuring system. High measuring accuracy is guaranteed by semi-automatic adjustment system with external mass standard. The weighing pan made of aluminium is covered with cork layer and features centering holders for the weights. The APP 5Y.KO series features an intuitive menu supporting a user in instrument operation. Correct operation of the mass comparator requires applying a special anti-draft shield which comes standard with the instrument.

The anti-draft chamber is an optional accessory intended for WAY KO mass comparators working in unfa (more)vourable conditions (air-drafts). It is mounted on a table, inside the mass comparator is placed. The chamber features sliding top and side panes allowing free access to the weighing chamber of the mass comparator. All components of the anti-draft chamber are made of metal and glass with conductive coating eliminating influence of electrostatics on the weighing result.

An additional anti-draft chamber dedicated for mass comparators APP KO series. It is intended for in (more)struments operating in unfavourable conditions (air movement, air gusts). The anti-draft chamber is installed on a weighing table, and a mass comparator is placed inside the chamber. The chamber features slidable side and top glass doors, thus ensuring free access to mass comparator’s weighing chamber. All components of the anti-draft chamber are made of metal and glass with conductive coating for eliminating influence of electrostatics on a measurement result.

An additional anti-draft chamber dedicated for mass comparators APP KO series. It is intended for in (more)struments operating in unfavourable conditions (air movement, air gusts). The anti-draft chamber is installed on a weighing table, and a mass comparator is placed inside the chamber. The chamber features slidable side and top glass doors, thus ensuring free access to mass comparator’s weighing chamber. All components of the anti-draft chamber are made of metal and glass with conductive coating for eliminating influence of electrostatics on a measurement result.

An additional anti-draft chamber dedicated for mass comparator APP.64.5Y.KO. It is intended for inst (more)ruments operating in unfavourable conditions (air movement, air gusts). The anti-draft chamber is installed on a weighing table, and a mass comparator is placed inside the chamber. The chamber features slidable side and top glass doors, thus ensuring free access to mass comparator’s weighing chamber. All components of the anti-draft chamber are made of metal and glass with conductive coating for eliminating influence of electrostatics on a measurement result.

Application: Mass comparator AKM-2 series featuring automatic mass loader enables automatic determin (more)ation of mass deviations of a single weight in a single cycle. The system of automatic mass comparator is commonly applicable in mass measuring laboratories, and particularly in certification units for weights classes E, F and M. Design and functionality: The supervising part of a mass comparator is a digital module which cooperates with a controller of instrument’s mechanical components. The automatic mass loader features a basis with self-centring fields, a robot and a steel body. The digital module and the robot are located in mass comparator’s weighing chamber. The loading robot is controlled by the computer’s controller. The instrument is operated by means of digital display which is plugged to mass comparator’s controller. Lengthwise shift of the loading robot with weights is carried out automatically using solenoid actuators. Additional software functions enable loading and taking off the weights, data processing and storing, and data export to instrument’s memory.

Application: Mass comparator AKM-2 series featuring automatic mass loader enables automatic determin (more)ation of mass deviations of a single weight in a single cycle. The system of automatic mass comparator is commonly applicable in mass measuring laboratories, and particularly in certification units for weights classes E, F and M. Design and functionality: The supervising part of a mass comparator is a digital module which cooperates with a controller of instrument’s mechanical components. The automatic mass loader features a basis with self-centring fields, a robot and a steel body. The digital module and the robot are located in mass comparator’s weighing chamber. The loading robot is controlled by the computer’s controller. The instrument is operated by means of digital display which is plugged to mass comparator’s controller. Lengthwise shift of the loading robot with weights is carried out automatically using solenoid actuators. Additional software functions enable loading and taking off the weights, data processing and storing, and data export to instrument’s memory.

Application: Mass comparator AKM-2 series featuring automatic mass loader enables automatic determin (more)ation of mass deviations of a single weight in a single cycle. The system of automatic mass comparator is commonly applicable in mass measuring laboratories, and particularly in certification units for weights classes E, F and M. Design and functionality: The supervising part of a mass comparator is a digital module which cooperates with a controller of instrument’s mechanical components. The automatic mass loader features a basis with self-centring fields, a robot and a steel body. The digital module and the robot are located in mass comparator’s weighing chamber. The loading robot is controlled by the computer’s controller. The instrument is operated by means of digital display which is plugged to mass comparator’s controller. Lengthwise shift of the loading robot with weights is carried out automatically using solenoid actuators. Additional software functions enable loading and taking off the weights, data processing and storing, and data export to instrument’s memory.