1.Please measure the tire pressure when the tire is cold. Use the tail end of the tire pressure gauge to the tire valve tightly, that is, the number display the highest value. 2. Please keep the front vertical direction to measure the pressure with the tire pressure gauge, and read the tire pressure. 3. Please check the tire pressure value (refer to the description of the car for this pressure value) and keep the tire pressure correct. 4. After the reading is completed, please the pressure relief valve to let the pressure in the pressure gauge drain. 5. After the measurement, re-lock the cover on the tire valve. note:To maintain the car normally, the tire pressure should be measured once a day Product name: Tire Manometer Measuring range: 3-200PSI Display mode: digital display Features: The readings can be retained, the measurement is accurate and , and 4 units of PSI, MPa, Bar, Kg/cm² can be switched Built-in battery: 2xCR2032 button battery Applicable models: General Working temperature: -20℃ -80℃ Colour:As Shown Material:Metal+Plastic Package Contents: 1 x pressure tester 2 x valve core 4 x tire cap 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.