Emilio Alarcón created this booze detector because he finally got pissed off at going to bars, buying the good stuff, and getting crap booze. Here’s how it works:

Just dip the Rotgutonix pen into a glass of alcohol (no mixers, please), and let it soak for 20 seconds. The pen’s liquid-crystal display will tell you if you’re about to drink some real whiskey or some nasty rotgut, it’ll tell you.

Unfortunately the device can currently only detect the chemical composition of 6 brands of liquor: Johnnie Walker, JB, DYC, Havana Club, Pampero and Brugal….The good news is that makers of the Rotgutonix are working on a future update that should allow it to detect up to 20 different booze profiles.

The only problem with using this device is that if you catch the bartender ripping you off and not giving you top shelf liquor and you confront him, you will probably be muscled out into an alley and given the biggest beating of your life.

Source: http://www.geekologie.com/2009/08/booze_detector_reveals_purity.php