Steps: 1.Please measure the tire pressure when the tire is cold. 2. Use the tail end of the tire pressure gauge to press the tire valve tightly, that is, the number will display the highest value. 3. Please keep the front vertical direction to measure the pressure with the tire pressure gauge, and read the tire pressure. 4. Please check the tire pressure value (refer to the description of the car for this pressure value) and keep the tire pressure correct. 5. After the reading is completed, please press the pressure relief valve to let the pressure in the pressure gauge drain. 6. After the measurement, re-lock the cover on the tire valve. Measuring range: 3-200PSI Display mode: digital display Features: The readings can be retained, the measurement is accurate and durable, and 4 units of PSI, KPa, Bar, Kg/cm2 can be switched Built-in battery: 2xCR2032 Applicable models: General Working temperature: -20 --80 Precautions To maintain the car normally, the tire pressure should be measured once a day Colour: black Material: metal Package Contents: 1 x manometer 2 x valve cores 4 x tire caps 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.