Take quick and accurate readings with this rugged, simple to use refractometer equipped with automatic temperature compensation. Ergonomic design allows for single hand operation and cleaning. Prism is made of scratch-resistant optical glass and the entire unit can be washed under running water. Units can also be calibrated with water. No expensive or messy standards are required for the ATAGO Pocket Refractometers. A factory certificate of calibration is available for this instrument, contact your Daigger Sales Representative for information and pricing. Units are powered by two AAA batteries (included), and measure 4%”L x2%”W x 14″D.