Pocket Digital Refractometer - AutomotiveMeasure concentrations in propylene gycol, ethylene gycol, battery acid and windshield washer fluid in the field with laboratory accuracy. As small, light and simple to use as optical refractometers, but with the precision of a digital readout. Reads samples as small as 1 ml. Sample temperature is initially displayed on the large LCD followed by the measurement results. The sophisticated microprocessor provides automatic calibration, automatic