Designed as a research quality instrument the Rudolph J357 Digital, Bench-top Refractometer has the highest performance of any refractometer in the Rudolph range. This instrument offers the same extra wide RI measurement range as our chemical industry refractometer model combined with the high accuracy of our food industry refractometer models. It also offers the most powerful automatic temperature control (heating and cooling) and is able to make RI and BRIX measurements at up to 120 °C.