Refractometer for measuring the density of battery acid. the cold resistance of windshield washer fluid and the cold resistance of coolant. With automatic temperature compensation function. Battery acid density measurement in the range of 1.1-1.5 kg/l. Ethylene 0 to 50ºC. Polypropylene 0 to 50ºC. Windshield washer fluid 0 to 40ºC.