H-B DURAC 60/80 Percent Alcohol Proof &ndash; Ethyl Alcohol Hydrometer (B61807-4500) DURAC alcohol proof - ethyl alcohol hydrometer is for determining proof of ethyl alcohol spirits Range: 60 to 80%; divisions: 0.2; accuracy: 0.2% proof; Temperature of Standardization 60F/60F Length: 305mm (12in); features a metal ballast Made according to the Bureau of Internal Revenue, US Treasury Department Includes Statement of Accuracy indicating accuracy traceable to NIST and DKD/PTB