Item Type: Tire Pressure Gauge Material: Rubber + Brass Gauge of Diameter: Approx. 57mm/2.2in Battery Type: Built-in Button Battery Battery Model: CR2025 Nominal Battery Capacity: 150mAh Pressure Range: 0-200psi Fitment: Universal How to Use: 1. Unscrew the tire valve. 2. Fix the copper head of the instrument to the valve. 3. The device will display the pressure. 4. You need to find the air pump (not included) and the air tube (not included) to connect the air nozzle, and hold the handle of the tire pressure gauge to inflate it through the inflator when the pressure is low, and vice versa. 5. After the measurement, unscrew the copper head and press the vent button to make the indicator change to 0. Package List 1 x Tire Pressure Gauge 4 x Tire Cap 4 x Copper Valve Core Due to manual measurement, please allow errors. 1Equipped with a LCD screen digital display, help you read the data clearly during the day or night. 2Can also help to check the tire pressure before driving to ensure that the tire pressure is normal and ensure driving safety. 3Press the unique deflation switch design to adjust to normal air pressure when the tire pressure is too high. 4The tire inflator pressure gauge is a better choice to extend the service life, reduce the burden on the vehicle. 5Made of high-quality rubber and brass materials, more durable and help you enjoy comfortable and smooth driving.