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Proof Hydrometers, Left to Right, 0-50%, 50-100%, 0-200%.

A device used to measure the precise ABV of an aqueous solution. A common method of using an alcoholmeter is to place it into an eprouvette during the distillation process which provides a method of continually monitoring the proof of the emerging distillate.

Alcoholometers and hydrometers represent some of the more valuable laboratory grade equipment available to the home distiller. Also known as a proof hydrometer.

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