SM0486
(2) General Laboratory Weights.
(3) Commercial Standards (state
references,
working
and
field
standards
used in law enforcement).
(4) Trade Weights (weights used in the sale of commodities and services).
Figure 1.
Mass Standards
c. Since all mass standards (weights) are basically the same, with exceptions
such as manufacturing tolerances and requirements, we restrict our instruction to
weight classification 1, which is typical of all classifications. Classification 1
is made up of four separate groups or classes of weights, which are:
Class J - Metric weights designed as mg standards.
Class M - Metric weights designed as reference standards for work of the
highest precision.
Class S - Metric weights designed as working standards for the calibration
of other weights.
Class S-1 Precision weights used for routine analytical work.
Included
weights are expressed in units of avoirdupois, apothecary, and
troy, as well as metric weights.
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