Handheld refractometer antifreeze freezing liquid proportion battery meter glycol concentration meter glass of water freezing point freezing point of antifreeze tester tester can quickly test of ethylene glycol and propylene glycol based antifreeze freezing and crystallization water measuring cell specific gravity (relative density). Can also be used for cooling water, refrigerant liquid for automobile antifreeze and the like. Freezing instrument refractometer is used to measure in both ethylene and propylene glycol-based automotive cooling systems and window cleaning solution in the freezing temperature, it can check the specific gravity of the electrolyte in the battery and use. Freezing water cooling system calibrated in degrees Celsius. Zero calibration: 20 ° C with distilled water at 20 ° C calibration environment. Antifreeze liquid freezing point and battery tester is based on the proportion of dual-use solution concentration (and the corresponding freezing point) the correspondence between the refractive index and optical instruments designed. Model: HT401ATC antifreeze freezing point Measuring range: antifreeze freezing EG -60 ~ 32 ℉ (ethylene glycol) antifreeze freezing PG -60 ~ 32 ℉ (propylene glycol) battery fluid B 1.1 ~ 1.4kg / L minimum scale: antifreeze 1 ℉ battery fluid 0.01kg / L Dimensions (mm): 30 * 40 * 160 Weight (g): 205 with automatic temperature compensation Automatic temperature compensation: 0-30 ℃