This 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.