Digital Refractometer, Accuracy 0.3 Deg.

Refractometer, Automatic, Range 0 Degrees to -54 Degrees C Windshield Washer Fluid, 0 Degrees to -57 Degrees C Ethylene Glycol, 1.000 to 1.463 Battery Electrolyte SG, Automatic Temperature Compensation Yes, Accuracy +/-0.003 SG (Battery Electrolyte), +/-0.1 Percent DEF (Diesel Exhaust Fluid), +/-0.5 Degrees F Engine Coolant Freeze Point, +/-1 Percent Engine Coolant, +/-2 Degrees F Windshield Washer Fluid Freeze Point, +/-5 Degrees F DOT3 Boiling Point, +/-5 Degrees F DOT4 Boiling Point