This instrument is used to check the B.R. VALUE in Oil.Divisions on the oil scale are sub-divided by Micro meter screw Error due to temperature changes in sugar solutions can be eliminated by temperature corrections device provided. It is an indispensable tool for use of all industries using sugar, oil & many other similar substances. Butyro Refractometer Index of Measuring range: 1.42 to 1.49 to an accuracy of 0.0002.Micrometer allows accuracy of 0.01% on the oil (Butyro) scale.