3 in 1 Multifunctional and Easy to Use: This is a pressure gauge for precise monitoring of tire pressure. It is also a tire inflator to fill tires when connecting to an air compressor. In addition, it has a built-in bleeder valve to quickly decrease pressure in overinflated tires. High Accuracy: Professionally calibrated to always return a reading within 1% of your exact tire pressure and 0.1 display resolution. No more guessing! Accurately measures from 0-250 PSI (0-17.2 Bar; 0-1724 Kpa; 0-17.5 kgf/cm) WATERPROOF SHUT OFF AND VALVE EXTENSION: The quick lock air chuck (push fit gas interface) gives a great seal to tire valve outside car tire and no leaks, freeing up your hands to operate the tire pump. Long lifespan: Made of high quality, heavy duty stainless steel and brass components to provide a very long lifespan. Use for any vehicle, like car, SUV, truck, motorcycle, bicycle etc. Easy to use: automatically turns on and off after 20 seconds of inactivity to preserve battery life; Integrated bleeder valve to quickly decrease pressure in overinflated tires. Product High-Quality Construction The first thing you’ll notice about this gauge is its weight. Only high quality stainless steel and brass were used to give a heavy-duty gauge that can withstand up to 250 PSI. The rubber hose is insulated and extra thick for superior performance. HIGH PRECISION 250PSI TIRE INFLATOR GAUGE Measuring range: 0-250PSI Accuracy: (1%+0.1 PSI) Four Units: PSI, BAR, KPA, KG/CM^2 Button Functions: On/off button(left), switch button/LED(right) Compatibility: 1/4 NPT air compressor connector (included) Operating voltage: DC 3.1V (2 AAA batteries included) How to use: 1. Unscrew the valve knot of the tire. 2. Fix the copper head of the gauge to the valve 3. The device will show the pressure. 4. You need to find an inflatable gas pump and connect the air mouth of it, hold the handle of the product to inflate through the pump, when pressure is low or vice versa. 5. After the measurement, unscrew the copper head and press the air bleed to make the display 0. All Suitable Accessories: 4 x Valve Caps 1 x Brass Air Chuck 2 x AAA Batteries 1 x Steel NPT Connector 1 x Roll of Thread Seal Tape 1 x Pneumatic Rotated Chuck 2 x Sealing Washers O