Semi-micro balances follow largely the design of their analytical counterparts, but
have 10 times the resolution of 0.01 milligram. This was achieved by much finer adjustment
of the beam and necessitated the inclusion of the beam within a chamber, formed by
fitting glass or metal plates below the arrestment frame. Capacity was usually limited
to 50 or 100 grams.
Model SM2 semi-micro balance. Capacity of 100 grams, resolution 0.02 mg by optical
projection. Weight loaded (2 decades) to 1 gram, air-damped, additional rider mechanism.
Otherwise very similar to the AD2.
The beam of the SM2.
Model SM12 semi-micro. In all features identical to the SM2, but in the "modern"