The MASTER-URC/NM refractometer is designed to measure Urine Specific Gravity quickly and easily with just a single drop of sample. The new plastic body design is resistant to corrosion from salty and acidic samples and incorporates an improved optics system for higher contrast and better clarity. The MASTER-URC/NM is a good choice when the water-resistant feature is not a priority, and the Temperature Compensation will be carried out manually.