3-in-1 Multi-Function and Easy to Use: This is a pressure gauge to accurately monitor tire pressure; It is also a tire inflator for inflating tires when connecting an air compressor. Additionally, it has a built-in air bleeder valve that quickly decreases pressure on over-inflated tires. High Accuracy: Professionally calibrated to always give you a reading within 1% of your exact tire pressure and 0.1 in display. More surprises Accurately measures from 0 to 250 PSI (0-17.2 Bar; 0-1724 Kpa; 0-17.5 kgf/cm) WATERPROOF STOP CHUCK & VALVE EXPANDER: The quick lock air chuck (interlocking gas interface) provides excellent sealing on the tire valve outside of the car tire and frees your hands to operate the tire pump. Great service life: Made of steel components stainless steel and brass of high quality and robust to offer it a very long life. Can be used with all vehicles, such as car, SUV, truck, motorcycle, bicycle, etc. Easy to use: automatically turns on and off after 20 seconds of inactivity to preserve your battery; built-in air bleeder valve to quickly reduce pressure in over-inflated tires.