Operation: Air inlet (G) of tire pressure gauge is connected to air source such as air compressor. (Only pressure measured if without air source), Twist the nozzle cap of the tire valve. Insert the inflatable clip nozzle (H) vertically into the tire valve nozzle and that there is no air leakage.<br> the left button (C) to the machine, and the right button (D) to switch the unit to BAR after the machine is started. After the adjustment, it be automatically saved for use. (When the tire is connected, it automatically turn on when the pressure is detected, showing the actual tire pressure.)<br> When the tire pressure is too low, the handle (F) to inflate, and when it is too high, the exhaust valve (E) to deflate. When the screen shows the air pressure value inflated needed done, remove inflatable clip nozzle (H). After , do not use automatic shutdown or long the left button to shut down.<br> Problems and Solutions: If there is too much water in the or the temperature difference in the use environment is large, the tire pressure gauge may appear negative pressure and not shut down. Remove the battery and reinstall it to restore the default setting.<br> The backlight is dark and the display is not clear. Please note whether the of battery power is at low voltage, and replace the battery in time ( battery is used in the product). Inflation is slow and air is not filled. Check whether the pressure of the is too low or the clamp is not completely open the valve core.<br> Features:<br> 100%<br> Item Type: Digital Tire Pressure Gauge<br> Application: Car, Van, Bus, Truck, Motorcycle, Bicycle, etc.<br> Display: LCD<br> Backlight: Yes<br> Unit: Psi, Bar, Kpa, Kg/cm2<br> Function: Inflation, Deflation, Pressure Gauge, PressureMonitoring<br> Power Supply: 2x AAA Batteries (included)<br> Working Temperature: -20°C~65°C<br> Pressure Range: 0-255Psi/0-18Bar/0