Metal structure, strong and . High-quality precision movement, accurate measurement and high durability. Rubber protective cover to protect the product. 360-degree rotatable copper , compact design. One-button deflation device, can easily adjust to the appropriate tire pressure. [Usage steps]: Unscrew the cap of the tire valve. Insert the copper of the tire pressure gauge into the valve and tighten it. The tire pressure gauge display the tire pressure. If the tire pressure is insufficient, please inflate; if the tire pressure is too high, press the deflation valve to exhaust. Generally, the suitable tire pressure for small cars is 28psi-35psi. After measuring, unscrew the copper , press the deflation valve to return the pointer to zero, and screw the cap of the tire valve back. Colour: Material:Plastic+Copper Package Contents: 1 * Tire Pressure Gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.