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 for inflating the tires when connecting an air compressor. In addition, it has a built-in vent valve that quickly lowers the pressure of overcrowded tires. High accuracy: Professionally calibrated to always get a reading within 1% of your exact tire pressure and 0.1 in the display. No more surprises Measures accurately from 0 to 250 PSI (0-17.2 bar; 0-1724 kpa; 0-17.5 kgf / cm) WATERPROOF SWITCH OFF AND VALVE EXTENSION: The quick-locking air liner (push-fit gas interface) provides an excellent seal of the tire valve outside of the car tire and releases your hands to operate the tire pump. Long service life: Made from high quality and robust stainless steel and brass components to ensure a very long service 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 save battery life. Integrated vent valve for rapid pressure reduction in overfilled tires. Product High quality construction The first thing you will notice about this meter is its weight. Only high quality stainless steel and brass were used to provide an extremely rugged level gauge that can withstand up to 250 PSI. The rubber hose is insulated and extra thick for superior performance. HIGH PRECISION 250PSI TIRE INFLATION INDICATOR Measuring range: 0-250PSI Accuracy: (1% + 0.1 PSI) Four areas: PSI, BAR, KPA, KG / CM ^ 2 Button functions: On / Off button (left), switch button / LED (right) Compatibility: 1/4 " NPT air compressor connection (included) Operating voltage: DC 3.1 V (2 AAA batteries included) How to use: 1. Unscrew the valve hub from the tire. 2. Attach the copper head of the measuring device to the valve 3. The device displays 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. Unscrew the copper head after the measurement and press the air purge so that the display shows 0. All suitable accessories: 4 x valve caps 1 x brass air mandrel 2 x AAA batteries 1 x " NPT steel fitting 1 x roll of thread sealing tape 1 x pneumatic rotated chuck 2 x sealing washers O