BUTYRO REFRACTOMETER :
This instrument can be used for measurment of fats in ghee and other such products giving a reading directly in terms of the oil scale also known as butyro scale. The micro meter eye piece allows an accuracy on this scale of 0.1 and the oil scale may also be converted into a refractive index scale using conversation tables. This allows measurement on materials with index of refraction in the range of 1.42 to 1.49 with an accuracy of 0.0002 as tables are suplied for converting oil scale reading into index of refraction, relative to mean sodium lines. The prism box is water jacketed for temperature control and a sample achromatising device enables the removal of all colors from the border line thus enabling the instrument to be used with white light.