Measures -60 to 32"F Propylene/Ethylene Glycol freeze point and 1.15 to 1.30 Specific Gravity of Battery Acid Automatic Temperature Compensation (ATC) Requires only 2 or 3 drops of solution The prism and lens with a simple focus adjustment Specifications Weight 7oz (200g) Dimensions 6.5x1.5x1.5in (165x38x38mm) Propyleneglycol freeze point -60"F (63%) to 32"F (12%) Ethyleneglycol freeze point 60"F (59%) to 25"F (16%) Specific gravity of Battery Acid 1.15 to 1.30 Items Included case calibration screwdriver plastic pipette calibration solution