Key benefits Accurate tire pressure display automatically when a tire is connected, showing the actual tire pressure. Builtin inflate and deflate controls to reach the exact pressure you need: inflate with handle F, deflate with exhaust valve E, and remove the inflatable clip nozzle H when the target pressure is reached. Simple operation and memory: left button C starts the unit, right button D switches the unit to BAR after start, and adjustments are automatically saved for future use. Quick recovery from readings glitches: if you encounter negative pressure readings caused by environmental factors, remove the battery and reinstall it to restore default settings. Easy connection and leak prevention: air inlet G connects to an air source such as an air compressor; twist the tire valve cap and insert inflatable clip nozzle H vertically into the tire valve to ensure there is no air leakage. Automatic on when connected: when the tire is connected, the device automatically turns on and displays the actual tire pressure. How it works and key controls Start and units: press left button C to start the machine. After startup, press right button D to switch the unit to BAR. Adjustments made are automatically saved for repeated use. Inflate and deflate: use handle F to inflate when the tire pressure is too low; use exhaust valve E to deflate when it is too . When the screen displays the required pressure, remove the inflatable clip nozzle H. Shutdown: to shut down, do not rely on automatic shutdown; press and hold the left button C to power off. Operation details Air source connection: air inlet G connects to an air source such as an air compressor. Pressure is measured while the device is connected to the air source. Valve preparation: twist the cap on the tire valve. Insert the inflatable clip nozzle H vertically into the tire valve nozzle to ensure there is no air leakage. Use scenarios Home car maintenance: quickly check and adjust tire pressure for daily driving, ensuring performance and safety. Bicycle or motorcycle tires: connect to a portable air source, inflate or deflate to the desired pressure, and store the setting for future use. Lawn equipment and ATVs: maintain proper tire pressures on lawn tractors, motorcycles, or small offroad tires using standard air sources.