Hydrometer Scale Alcohol Proof Scale Divisions 0.2 Percent / +/-0.3 Percent Tolerance Range 75 to 95 Percent Length 305mm Accuracy +/-0.3 Percent Degrees Hydrometer Solution Temp 60 Degrees F/15 Degrees C Calibration Increments 0.002 Hydrometer Internal Revenue Code K Application IRS Alcohol Standards IRS