With more sophisticated testing and more frequent auditing of laboratory equipment, it has become increasingly necessary for laboratories to have their own calibration weights. Gilson Calibration Masses are offered to check span and linearity, and calibrate electronic balances. Click on any model number for a complete description of these weights and their applications.

Ultra Class: For analytical and sensitive balances and applications that demand superior accuracy.
ASTM Class 1: For analytical balances and applications requiring first-order accuracy.
ASTM Class 4: For most balances less sensitive than 0.01g and applications having average accuracy requirements.
NIST Class F: For higher capacity, less sensitive balances and scales.