This instrument can widely be used in petroleum, chemical, pharmaceucaI, sugar refining and food industries, as well as in related colleges, universies and scienfic research instuons for measuring refracve index nD of transparent, semi transparent liquid. This instrument can also be used to measure the Brix (BX) of the sugar soluon, and correct the effect of temperature on the Brix automacally. In addion, this instrument can also display the temperature of the sample.