Waterproof Digital Refractometer - Brix 0 to 88%This refractometer is housed in a protective, rubberized IP65 waterproof case to safeguard from wet environments, and makes for easy cleanups. Measure samples as small as 1 ml, in the field with laboratory accuracy. Sample temperature is initially displayed on the large LCD followed by the measurement results. The sophisticated microprocessor provides automatic calibration, automatic temperature compensation and automatic shutoff (after 3 minutes).