1) Measuring instrument 
instrument for measuring proportion of alcohol in solutions
• (n.) Alt. of Alcoholmeter
An alcoholometer is an instrument constructed on the principle of the hydrometer, to determine from the specific gravity of spirituous liquors the percentage of alcohol they contain, the scale marking directly the required proportion. If the liquor contain anything besides water and alcohol, previous distillation is necessary.
alcoholometer, alcoholmeter A hydrometer or other device that determines the amount of alcohol in an aqueous (liquid) solution.
an instrument for finding the percentage of alcohol in a liquid.