The project is a mechanical tire pressure gauge for cars, trucks, motorcycles and bicycles. Regularly check the tire pressure to ensure driving safety. The air pressure range is 0-7kg, 0-100lb/in. A useful tool for maintaining correct tire pressure, reducing tire wear and extending tire life for your car, bicycle or truck. How to use 1. Unscrew the tire valve cap. 2. Screw the tire pressure gauge copper nozzle into the tire valve and tighten 3. The tire pressure gauge will show your tire pressure 4. If the tire pressure is too low, please inflate the tire; if the tire pressure is too high, please open the exhaust valve to reduce the tire pressure. 5. After measuring the tire pressure, please unscrew the copper nozzle, close the exhaust valve, reset the pointer to zero, and tighten the tire valve chamber cover. Specifications 【Name】High precision tire pressure gauge [Material] Stainless steel alloy + high quality rubber [Size] 27.5 cm "7 cm 【Weight】About 0.2kg 【Range】0-7kg/cm 0-100lb/in