The body of the instrument is fixed having a leaning of 60o, correct refractive index and sugar percentage can be read directly in the field.
It consists of an abbe double prism compensator, telescope mirror limb, graduated, sector, reading, magnifier and a radial arm which carries a Vernier. Abbe's double prisms leaves a narrow space (about 0.1 mm) between the adjoining faces of prisms and compensator consists of the amici prisms which serves for rendering the line of achromatic separation. A thermometer is fitted on the double prism.
- ND Range: ND 1.300 to ND 1.700 In step of 0.001
- Accuracy: + 0.0002
- Sugar (Percentage): 0 to 95% in steps of 1 division
- Accuracy: 0.5%
- Temperature: 0 - 100oC