Waterproof Digital Refractometer - Diesel Exhaust FluidHoused in a protective Rubberized IP65 waterproof case to safeguard the electronics from wet environments and makes for easy clean UPS. 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). features