Digital Refractometer, Automatic, Range 1.000 to 1.463 Battery Electrolyte SG, 32 Degrees to -60 Degrees F Propylene Glycol, 32 Degrees to -65 Degrees F Windshield Fluid, 32 Degrees to -70 Degrees F Ethylene Glycol, Automatic Temperature Compensation Yes, Accuracy 0.003 SG battery electrolyte, 0.5 deg F Glycol, 2 deg F Winshield Fluid, Resolution 0.003 SG Battery Electrolyte, 0.5 deg F Glycol, 2 deg F Windshield Fluid