Analog Refractometer, Range -50 Degrees to 0 Degrees C Ethylene Glycol, -50 Degrees to 0 Degrees C Propylene Glycol, 1.10 to 1.40 Battery Acid, Automatic Temperature Compensation Yes, Accuracy +/-0.01, Function Measures the Concentration of An Aqueous Solution By Measuring Its Refractive Index, Specific Gravity 1.10 to 1.40, Freezing Point -58 Degrees to 0 Degrees F Ethylene Glycol, -58 Degrees to 0 Degrees F Propylene Glycol This product contains a chemical that is regulated under California Proposition 65. Warning: This product contains a chemical known to the State of California to cause cancer. -