Refractometer, Coolant/Battery ( Degrees F), Range 32 Degrees to -60 Degrees F Ethylene Glycol, 32 Degrees to -60 Degrees F Propylene Glycol, 0-63 Propylene Glycol, 0-70 Ethylene Glycol, 1.100-1.400 Electrolyte Specifc Gravity, Automatic Temperature Compensation Yes, Accuracy +/-1 Degrees F, Resolution 0.01 RI, 5 Degrees F, Function Battery Electrolyte Specific Gravity And Charge Level, Concentration Of Ethylene Glycol And Propylene Glycol, Freeze Points Of Ethylene Glycol And Propylene Glycol