Calibration Weights
Electronic balances must be calibrated with a mass standard upon installation and on a regular basis thereafter. Calibration values vary over time because of changing conditions within the balance or its environment, such as movement or relocation of the balance, differing gravitational forces, temperature variations and aging electronic components.
Which Class is Right for My Application?
A balance should be calibrated using a weight with a class tolerance factor greater than the readability of the balance. Example: A toploading balance with readability of 0.01g may be calibrated with a weight having a known tolerance of at least 0.009g.
Sartorius ANSI/ASTM Class 1 Calibration Weights
ANSI/ASTM class 1 calibration weights provide high precision as reference standards in calibrating other weights and are appropriate for calibration of high precision analytical balances (from 0.01mg to 0.1mg).
Sartorius ANSI/ASTM Class 2 Calibration Weights
Sartorius ANSI/ASTM class 2 calibration weights are appropriate for calibrating high precision toploading balances with readabilities ranging from 0.001g to 0.01g.
Sartorius ANSI/ASTM Ultra Class Calibration Weights
Sartorius ANSI/ASTM Ultra class calibration weights are appropriate for calibrating high resolution analytical balances with tolerances approximately two times the precision of ANSI/ASTM Class 1.