Hydrometer - Proof & Tralles (Alcoholometer)

Used to measure alcohol in distilled spirits. Similar in use to a brewing hydrometer, but assumes no sugar is in the solution. You must float in a sample to obtain a reading. Also called a alcoholometer.

 

Note: This DOES NOT work for taking readings for beer or wine.  If your intent is to measure the graivity (sugar density) in beer and wine, you need a hydrometer.