[Material]: Metal + Plastic [Size]: Length: 10cm, head width 5cm, height 2.5cm. [Use]: Measure the tire preure of the car and deflate the tire. (Note: deflation cannot control the air preure at any time.) [Features]: Portable tire preure gauge. Psi: preure range (0.5-7.5 / 0-100), accuracy (+/- 2%) Preure unit: lb/sq.in, and kg/cm2 Feature 1. Metal construction, super durable and durable. 2, high-quality precision movement, high precision measurement and durability. 3, identify LBS, KBS two preure units, it is recommended to interpret the internal preure of various vehicle pneumatic tires. 4, the general car is suitable for tire preure of 28-35 pounds (28-35LBS / SQ.IN), the specific standard is based on the data in the car's product manual. Applicable models: universal Precaution 1. Unit conversion 1kgf/cm2=98kpa 2, normal maintenance of the car, should be measured once a month tire preure Step 1. Unscrew the cap of the tire valve. 2. Screw the copper head of the tire preure gauge into the valve and tighten it. 3. The tire preure gauge will display the tire preure. 4. If the tire preure is insufficient, please add gas. If the tire preure is too high, please pre the bleed valve to fine-tune the preure. 5. After the measurement is completed, unscrew the copper head and pre the bleed valve to zero the pointer. Screw back the original tire valve cover