This DURAC® alcohol proof - ethyl alcohol hydrometer is for determining proof of ethyl alcohol spirits. Made according to the Bureau of Internal Revenue, US Treasury Department. The tolerances listed for the hydrometer are those outlined in Circular 555 of the National Bureau of Standards, Testing of Hydrometers. The hydrometer is individually serialized, features readings in 0.2 divisions, are 305mm (12in) long and features a metal ballast. Includes multi-language (English, French, German, Italian, Portuguese and Spanish) Statement of Accuracy indicating accuracy traceable to NIST and DKD/PTB. Tested and calibrated in H-B Instrument's exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST and DKD/PTB. Temperature of Standardization 60°F/60°F. Internal Revenue Code: F. Range: 0 to 20%. Divisions: 0.2. Accuracy: 0.2% Proof. Length: 305mm (12in).