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For the measurement of angle of rotation of optically active substance in solution i.e. angle through which the plane of polarised light is rotated on passing through a specified length of solution of known concentration. Specific rotation may then be determined. The circular head is attached near the analyser and vernier movement on the scale enables the reading of optical rotation accurate upto the accuracy of 0.1 .

Soleil's Bi-Quartz or Laurents half shade device which makes the instrument accurate and simple for use with white light (day light) or sodium light. The polarimeter tubes made form Borosilicate glass with metal fittings at both ends. The tube end covers with glass round disc, optically true with rubber washers to make it leak proof. Complete with a set of two polarimeter tubes (100mm and 200mm), in wooden case, nicely polished.