H-B Instruments Alcohol Proof - Ethyl Alcohol Hydrometer For determining proof of ethyl alcohol spirits. Made according to the Bureau of Internal Revenue, US Treasury Department. The tolerances listed for these hydrometers are those outlined in Circular 555 of the National Bureau of Standards, Testing of Hydrometers. Hydrometers are individually serialized, feature readings in 0.2 divisions, are 300mm (12”) long and feature a metal ballast. Hydrometers include multi-language (English, French, German, Italian, Portuguese and Spanish) Statement of Accuracy indicating accuracy traceable to NIST and DAkkS. Tested and calibrated in our exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST and DAkkS. Temperature of Standardization 60°F/60°F. After manufacture each hydrometer is hand inspected by our U.S. quality team.
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