The AlcoHAWK PT500 breathalyzer incorporates PT Core fuel-cell sensor to eliminate false-positives with an accuracy of +/-.005 at the point of calibration. With a simple, menu-driven operation and large back-lit LCD screen, the new PT500 is easy to use and read. It features a very fast recovery time, which makes the unit ideal for roadside screening and use by corrections personnel, probation officers, and others.