Hydrometer Scale Alcohol Proof Scale Divisions 0.2 Percent / +/-0.2 Percent Tolerance Range 185 to 206 Percent Length 305mm Accuracy +/-0.2 Percent Degrees Hydrometer Solution Temp 60 Degrees F/15 Degrees C Calibration Increments 0.002 Hydrometer Internal Revenue Code R Application IRS Alcohol Standards IRS