Instrument has two Analyzers. One Analyzer is binocular and
is identical with that used on Model No. 204. The other Analyzer
is a microscope equipped with its own sensitive tint plate and
its own quarter wave plate. The standard instrument has a magnification
of 10X, although 20X is available. Calibration for each of the
Analyzers is through 180 degrees clockwise and counter-clockwise
with readings by single degrees.