A proof and tralle hydrometer is used for testing the alcohol content of distilled spirits. Scales: Proof: 0-200 Tralle: 0-100 This proof & tralle scale determines the direct percentage of alcohol in liquids with a specific gravity less than zero. Just put a sample of unsweetened liquid containing alcohol in a test jar and float the hydrometer in the liquid. The hydrometer is fragile so stay mindful not to drop it or bounce it off the bottom or sides. Next, gently spin the hydrometer to release any bubbles that are sticking to it. Fix yourself at eye level to read the number off the scale where the hydrometer emerges from the liquid. Be sure to read across the two bottom corners of the frown and not at the meniscus.
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