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Keenso-- This digital tire pressure gauge is used to monitor the tyre pressure for extending tire life and ensuring safety. Built of high quality, heavy duty zinc alloy and brass components that provide lasting performance. We stand behind all of our them with a 100% product guarantee and promise to give you the best in customer care! Specifications: Material: Rubber + Metal Iron + Brass Range: 0-220psi, 0-16bar Size: 7.2 × 23cm/2.8" × 9" Rubber Hose Length: 35cm/14" Package Weight: approx. 370g How to Use: 1. Open the tire valve. 2. Connect the air inlet and the tire valve closely. 3. Turn on the device, read the tire pressure data. 4. If the tire is under-inflated, please aerate it (connect the device with an air pump and press the handle) If it is over-inflated, press the valve to deflate the air. 5. Finish your checking, take off the device and screw up the tire valve cap. Package Included: 1 × Digital Tire Pressure Gauge Notes: 1. The vehicle must be parked on the ground, and the tire pressure must be measured when the vehicle is cold. 2. First check of tire pressure gun the readings are "0" position, if not, please reset. 3. Check the tire pressure valve cover, after the pressure gun nozzle alignment on the tire valve, then pressing into vertically, the pressing speed needs to be fast, so it will not cause air leakage inside the tire. 4. Observe whether the pointer is stable when pressing the tire pressure, after the pointer is stable, pull out quickly and read the data. (general can immediately obtain stable tire pressure readings) 5. Check the tire pressure at least once a month, and measure several times before not skilled in measuring tire pressure.