This proof alcoholmeter (hydrometer) has two scales by which to take measurements and readings of higher alcohol beverages. The proof scale is the US international revenue scale for proof of spirits, and measures them on a scale from 0 to 200. The tralle scale measures the direct alcohol percentage in a liquid, from 0 to 100%. This hydrometer is calibrated at 60°F. Its use is not recommended with beer or wine.
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