The Vastar breathalyzer is used to measure the concentration of alcohol in the human body. With a sensitive semi-conductor sensor, it takes only 5 seconds to show whether you can drive or not after drinking. It will show you high accuracy test results (up to 0.01mg/l). Four units of measurement can be converted (%BAC , ‰BAC, mg/l, mg/100ml). This breathalyzer is space-saving, lightweight and portable. Just put it in your pocket. With the current 39% off deal you can pick it up for just $18.99, a significant discount from its typical $32.99 list price. See the Vastar breathalyzer on Amazon.