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Mettler Toledo PB Series Precision Analytical Balances PB303-S & PB503-S

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Maximum Capacity
60 g/310 g (PB303-S) 510 g (PB503-S)
Readability
0.001 g/0.01 g (PB303-S) 0.001 g (PB503-S)
Repeatability
0.001 g
Linearity
0.01 g (PB303-S) 0.002 g (PB503-S)
Calibration
Internal FACT (Fully Automatic Calibration Technology)
All 12 specifications
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Specifications 12

Brands
Mettler Toledo
New/Used
Used
Maximum Capacity
60 g/310 g (PB303-S) 510 g (PB503-S)
Readability
0.001 g/0.01 g (PB303-S) 0.001 g (PB503-S)
Repeatability
0.001 g
Linearity
0.01 g (PB303-S) 0.002 g (PB503-S)
Calibration
Internal FACT (Fully Automatic Calibration Technology)
Connection
RS-232
Stabilization Time
2 s
Dimensions
10x13x10”
Weight
11 lbs
Electrical
8-14.5V, 50/60Hz, 6VA

Product description

Precision balance with up to 510 g capacity, 0.001 g readability, automatic calibration for molecular diagnostics.

The Mettler Toledo PB Series Precision Balances (PB303-S and PB503-S) are high-accuracy electronic balances designed for laboratory environments requiring precise mass measurements essential in molecular diagnostics, bioprocessing, and biotechnology research. These balances feature:

  • Maximum Capacity: PB303-S offers dual ranges of 60 g (fine) and 310 g; PB503-S supports up to 510 g
  • Readability: 0.001 g for both PB303-S (fine range) and PB503-S, facilitating critical quantification for gene editing and synthetic biology workflows
  • Linearity: ±0.01 g (PB303-S), ±0.002 g (PB503-S) ensuring stable and consistent measurements crucial in biomanufacturing applications
  • Repeatability: 0.001 g for reliable sample analysis
  • Utilizes MonoBlock weighing technology with integrated shock and overload protection, safeguarding sensitive weighing elements during daily lab operations
  • Equipped with internal FACT (Fully Automatic Calibration Technology) for seamless calibration adaptability, supporting compliance in biomedical engineering and molecular cloning protocols
  • Supports RS-232 connectivity allowing integration with laboratory data management systems for traceable results
  • Rapid stabilization time (~2 seconds) optimizes throughput in high-demand clinical diagnostics and fluorescence analysis workflows
  • Robust construction with impact- and chemical-resistant housing ensures durability in diverse biotechnology lab settings

The PB Series balances support traditional weighing, taring, piece counting, percent weighing, and dynamic weighing for unstable samples, making them widely adopted in synthetic biology research and essential for bioprocessing quality control. Their precision and reliability make them critical instruments in laboratory workflows requiring exact mass measurements across various life sciences and biomedical applications.

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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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Can't find the exact configuration?

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Last updated 4 September 2026