DRA-403C Digital Battery / Antifreeze / Cleaning Fluid Digital Instrument Digital freezing antifreeze tester digital battery count significant proportion of liquid cleaning fluid freezing point tester DRA Series Battery / Antifreeze / Cleaning Fluid Digital refractometer Miriam DRA Series Battery / Antifreeze / Cleaning Fluid Digital refractometer for measuring the concentration of the battery and antifreeze solution designed. For measuring the freezing point and windshield cleaning fluid freezing in propylene glycol and ethylene glycol-based antifreeze system can also be used in the electrolysis of proportion and check the battery use. With automatic temperature compensation system. Temperature measuring range: 0 ℃ -40 ℃ (32-104 ° F) temperature measurement accuracy: ± 1 ℃ (2 ° F) temperature measurements Min: 0.1 ℃ Operating temperature: 0-40 ℃ (32-104 ° F ) Storage temperature: -10-50 ℃ (14-122 ° F) volume: 185 × 59 × 45mm Weight: 230g Power: a battery (9v) frequency of use: 2000 times / per battery automatic temperature compensation automatically closing temperature Compensation Fahrenheit, Celsius conversion voltage is not enough to automatically alert