![4 Units](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)
Instructions
Instructions:
1. The default backlight and the small flashlight will be on together when starting up.
Short press to switch the testing unit, long press for 2 seconds to automatically switch the small flashlight on and off, and long press for 3 seconds to manually shut down.
2. Hold pressure value for 30 seconds after checking the tire pressure, it will automatically return to zero. Or during the 30 seconds, we can short press the button to automatically return to zero;
3. When switching the test tire, the hold value will display the new tire pressure value;
4. The backlight will automatically turn off after 30 seconds without any operation, and it will automatically shut down after 90 seconds.