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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