Function Description:1. Measure the tire pressure when the car is idle2. Press "on" to start the machine, and it will automatically reset and display "0.0"3. Align the air valve of the tire pressure gauge with the automobile tire valve and press it in (remove the tire valve cap first) without air leakage, and release it after maintaining a stable measurement value4. The measured value will be maintained for about 90 seconds, and then the display will turn off automatically5. Press and hold the "on" key for 3 seconds to force shutdown6. This product has four unit modes for air pressure measurement:Psi (LBF / in2, suitable for USA)Bar (bar, suitable for European use)KPa (kPa, suitable for Southeast Asian countries)Kg / C (kg, suitable for China)Press the "on" key repeatedly to switch7. Pull the sliding switch to the appropriate position to turn on the LED lamp and flashlightSpecificationsOperating temperature range: 30 to 122 C (0 to 50 C)Measurement range: 2 to 150psiMeasurement error value: 1psiBattery: flashlight, LED lamp and LCD backlight: 7# battery * 2Tire pressure emergency flashlight, main functions1. Flashlight, emergency use;2. Tire pressure gauge to ensure correct tire pressure, prevent tire burst and ensure driving safety;3. Life hammer, for escape use;4. The safety belt cutter can quickly cut the safety belt to ensure safety.