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Calibration Weights for Balances

Sophisticated testing and frequent auditing of procedures and equipment has made it increasingly important for laboratories to set up and maintain a calibration program for their balances. Gilson Calibration Weights for balances are available in Ultra Class, ASTM Classes 1 and 4, and NIST Class F to check span and linearity, and calibrate laboratory balances and scales.

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Precision Calibration Weights with ranges of 1mg—100g and 1—100g are available as sets in Ultra Class, ASTM Class 1 and ASTM Class 4. Weights are supplied in 5-2-2-1 series as ASTM E617 specifies. Packed in protective plastic cases.

NIST Traceable or NVLAP Certificates are available for all calibration weights and sets. Traceable Certificates document traceability to NIST and compliance with ASTM or OIML specifications. NVLAP Weight Calibration Certificates should be requested by users who must provide certification to ISO, FDA, ANSI or other requirements.

  • ASTM Class 1 – For analytical balances and applications requiring first-order accuracy. ASTM Class 1 weights are highly-polished stainless steel. Several models in varying mass ranges are available to choose from with optional NIST Traceable or NVLAP certification.
  • ASTM Class 4 – Used with balances less sensitive than 0.01g, and for applications requiring average accuracy. ASTM Class 4 weights are constructed of satin-finished stainless steel. Models are available with optional NIST Traceable or NVLAP certification.
  • NIST Class F – Designed for higher capacity, less sensitive balances and scales, NIST Class F models are also available with optional NIST Traceable or NVLAP certification. They are constructed of cast iron with integral grip handles.
  • Ultra Class – Designed to provide superior accuracy for analytical and sensitive balances and applications that demand it, Ultra Class boasts weight tolerances 40-50% tighter than ASTM Class 1 and equal to or exceeding OIML Class E2. They are constructed of highly polished stainless steel. Models are available with optional NIST Traceable or NVLAP certification.