Easy alcohol concentration measurement, just breathe into it. Alcohol Checker ■ Features Easy alcohol concentration measurement, just breathe into it. The delicate sensor is retractable for protection. Palm-sized, making management and operation easy. Battery-powered, so you don't have to worry about "not being able to use it because it's out of charge." I will accept price reductions, so please comment. Also, I have 5 in stock, so if you want to buy in bulk, please comment. ^ ^