3 in 1 Multifunction and Easy to Use: This is a pressure gauge to accurately monitor tire pressure; It is also a tire inflator to inflate the tires when connecting an air compressor In addition, it has a built-in air bleed valve that quickly lowers the pressure of 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 No more surprises Measures accurately from 0 to 250 PSI (0-17.2 Bar; 0-1724 Kpa; 0-17.5 kgf / cm) WATERPROOF SHUT-OFF CHUCK AND VALVE EXTENSION: The quick-locking air chuck (push-fit gas interface) provides excellent sealing on the tire valve outside the car tire and releases your hands to operate the tire pump Long Life: Made of high quality and sturdy stainless steel and brass components to give it a very long life Can be used with all vehicles, such as car, SUV, truck, motorcycle, bicycle, etc Easy to use: turns on and off automatically after 20 seconds of inactivity to conserve your battery; Integrated air bleeder valve to quickly reduce pressure in over-inflated tires Product High quality construction The first thing you will notice about this gauge is its weight; only high quality stainless steel and brass have been used to provide an extremely sturdy inflation gauge that can withstand up to 250 PSI.The rubber hose is insulated and extra thick for superior performance HIGH PRECISION 250PSI TIRE INFLATION GAUGE Measuring range: 0-250PSI Accuracy: (1% + 0.1PSI) Four ranges: PSI, BAR, KPA, KG / CM ^ 2 Key Function: On / Off Key (Left), Switch Key / 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 from the tire 2.Attach 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 hose to connect the inflatable mouthpiece and hold the handle of the product Inflate it through the inflator when the pressure is low or vice versa 5.After the measurement, unscrew the copper head and press the air purge so that the indicator is at 0 All Suitable Accessories: 4 x Valve Caps 1 x Brass Air Mandrel 2 x AAA Battery 1 x " NPT Steel Fitting 1 x Roll of Threaded Seal Tape 1 x Pneumatic Twisted Chuck 2 x Sealing washers O Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.