Airchecker Digital Air Gauge features "real time" pressure readings to 1/10 of a PSI. This amazing feature allows you bleed air off your tire with the Airchecker&';s bleed button and know immediately the new pressure. Airchecker reads accurately to very low pressures. Swivel head. Backlit display. Reads in Bar & PSI Compatible with Presta, Schrader and Dunlop Valves CR2032 battery included