ASTM Class 1 Calibration Weight Sets
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These weights do not include NIST NVLAP Certificates.
Storage case is included, and may vary from the picture shown depending on weights included with set.
Which calibration weight should you choose?
A balance should be calibrated using a weight with a class tolerance factor greater than the readability of the balance. For example if your balance has a readability of 1mg it should be calibrated with a weight having a known tolerance of .1mg or less.
What are the class differences?
OIML E2 provides the greatest precision we offer. They are ideal for use as reference standards to calibrate other weights or for calibrating high-resolution analytical balances. The OIML E2 tolerance is approximately two times the precision of ANSI/ASTM Class 1.
ANSI/ASTM Class 1 can be used as reference standard in calibrating other weights and appropriate for calibrating high-precision analytical balances (from 0.01mg to 0.1mg).
ANSI/ASTM Class 2 Appropriate for calibrating high-precision toploading balances with readabilities ranging from 0.001g to 0.01g.
ANSI/ASTM Class 3 Appropriate for calibrating balances with moderate precision, ranging from 0.01g to 0.1g.
ANSI/ASTM Class 4 Appropriate for student use and semi-analytical weighing.
NIST Class F Used to test commercial weighing devices by state and local weights and measures officials, device installers and service technicians. Class F weights may be used to test most accuracy class III scales, all scales of class III L or IIII, and scales not marked with a class designation.
|(OIML) International Organization of Legal
Metrology Recommendation R111