Description Easy Change Chuck System 1 Button Operation Auto shut-off for increased Auto Battery life Displays KGF, BAR, PSI, KPA measurement Large face LCD digital read-out Unit covered with rubber sleeve for extra comfort and durability On Power Button, auto shut off in 90 seconds if not in use LCD Back Light Allows accurate reading of tire pressure, assisting with TPMS (Tire Pressure Monitoring Systems) Two position lever. 1st position deflates, 2nd position inflates Works on a nitrogen system With 21"; Hose ON/UNIT/LIGHT: Press once to turn on. Press again to turn on backlight. When the unit is on , press for 3 seconds to switch units. Measuring Range: 3 ~ 175psi Units: PSI / BAR / KPA / KGF Resolution: 0.1 PSI Working Temperature: 32"