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Ohaus Portable Conductivity and TDS Meter ST300C

UsedOhausConductivity metersUnited States

From€1,314.78excl. VAT

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Measurement Range
00.0 μS/cm – 199.9 mS/cm; 0.1 mg/L – 199.9 g/L (TDS); 0 – 100 °C
Measurement Resolution
0.01 μS/cm; 0.1 mg/L; 0.1 °C
Display
LCD
Electrode
STCON3 (Included)
Accuracy ± (Temperature)
0.3 °C
All 22 specifications
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Specifications 22

Brands
Ohaus
New/Used
Used
Measurement Range
00.0 μS/cm – 199.9 mS/cm; 0.1 mg/L – 199.9 g/L (TDS); 0 – 100 °C
Measurement Resolution
0.01 μS/cm; 0.1 mg/L; 0.1 °C
Display
LCD
Electrode
STCON3 (Included)
Accuracy ± (Temperature)
0.3 °C
Battery Life
250 Hours with Disposable Batteries
Calibration
1 Point
Conductivity accuracy (±)
0.5 %
Conductivity measuring range
0.01 μS/cm-199.9 mS/cm
Dimensions (HxLxW)
1.38 in x 6.69 in x 3.54 in (35 mm x 170 mm x 90 mm)
In-use cover
No
Measurement Range (Temperature)
0 °C – 100 °C
Net Weight
0.35 lb (0.16 kg)
Parameter
Conductivity / TDS
Power
4 AAA (LR03) Batteries (Included)
Resolution Cond. (Variable)
0.01 – 1
Temperature Compensation
Automatic
Temperature Resolution
0.1 °C
Temperature Sensor
30 KΩ NTC
Working Environment
41°F – 104°F, 80%RH, non-condensing (5°C – 40°C, 80%RH, non-condensing)

Product description

Portable meter measuring conductivity, TDS, and temperature with automatic compensation, 0.5% accuracy.

Ohaus ST300C Portable Conductivity Meter

  • Measurement Range:
  • Conductivity: 00.0 μS/cm to 199.9 mS/cm
  • TDS: 0.1 mg/L to 199.9 g/L
  • Temperature: 0 °C to 100 °C
  • Resolution:
  • Conductivity: 0.01 μS/cm
  • TDS: 0.1 mg/L
  • Temperature: 0.1 °C
  • Accuracy:
  • Conductivity: ±0.5%
  • Temperature: ±0.3 °C
  • Calibration: Single-point calibration with automatic or manual endpoints; recalls last calibration data easily.
  • Electrode: STCON3 galvanic electrode (included); ready for immediate use without warm-up time.
  • Display: LCD
  • Power: 4 AAA (LR03) disposable batteries included; approx. 250 hours battery life.
  • Temperature Compensation: Automatic using 30 KΩ NTC temperature sensor.
  • Dimensions: 1.38 in x 6.69 in x 3.54 in (35 mm x 170 mm x 90 mm)
  • Weight: 0.35 lb (0.16 kg)
  • Operating Environment: 5 °C to 40 °C, 80% RH non-condensing (41 °F to 104 °F)
  • Additional Features: Quick calibration, fast measurement delivery, and user-friendly operation suitable for portable field use.

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Frequently asked questions

How long does laboratory equipment typically last?

With a service contract, ten to fifteen years is normal for most benchtop instruments. Detectors and pumps are the parts that wear first.

Can I get service for older equipment?

Often, yes. Verified suppliers frequently work with service partners converting the instrument. If applicable, we can list servicing options alongside the offer.

Where can I buy parts?

Ask a scientist through the request button. Parts are often available even when the instrument itself is discontinued.

What is the typical lead time for refurbished equipment?

Two to six weeks, depending on refurbishment scope and whether calibration is included.

Does laboratory equipment ship internationally?

We ship to 38 countries. Crating and customs handling are quoted with the instrument.

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Last updated 9 November 2026