1. Please measure the tire pressure under the condition that the tire is cooled. 2. Tightly press the tire valve with of the tire pressure gauge, that is, the digital display shows the highest value. 3. Please keep the vertical pressure measurement with the tire pressure gauge and read the tire pressure. 4. Please check the tire pressure value (this pressure value refers to the of the car) and keep the tires at the correct pressure. 5. After the reading is completed, please press the pressure relief valve to the pressure inside the pressure gauge. After measuring, re-lock the cover on the tire valve. Normal maintenance of the car, the tire pressure should be measured once a day Color: black + red Material: copper + rubber Package Content: 1* Pressure Gauge 2* valve core 4* tire cap Only the above package content, other products are not included. Note: Light 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.