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The models have only one unit system: °F. With the indication we may know the freezing point of either ethylene glycol or propylene glycol based cooling systems. You can use this measurement tool to measure and Check Washer Fluid.With ATC(automatic temperature compensation) . Ethylene Glycol: -60°F-32°F Propylene Glycol: -60°F-32°F Battery SG: 1.100-1.400sg Windshield Washer Fluid: Ethanol + water :32°F to -40°F, Sopropyl alcohol + water (SRF1): 32°F to -40°F