... can keep your tire safe before you drive out and it also can measure the tire depth let you ... press the on/ off button to change among PSI , BAR and KPA on LED3, build in LED light4, equipped with replacement ... THE BUTTON,THE LED SCREEN WILL CHANGE AMONG PSI,BAR,KPA.2.PUT TIRE GAUGE MOUTH INTO THE INFLATING ... VALVE QUICKLY, TO BE SURE IT IS AIRPROOF AND KEEP 2-3 SECOND. PULL OUT TIRE GAUGE, READ ...