1. unscrew the tire valve node.2. Fix the copper gauge head for the valve3. the device will show the pressure.4. You need to find an inflatable pump and gas pipe to connect the inflatable mouth and keep the handle of the product inflating through the inflation device, when the pressure is low or vice versa.5. after the measurement, unscrew the copper head and press the air bleed button to make the light for 0.Display mode: LCD digital displayMeasuring range: 3 ~ 200PSI / 14BAR / 14Kgf / cm ^ 2Working temperature: -10 to 50 CButton function: open key (left), unit switch key (right)Working voltage: DC3.1V (with a pair of 1.5V 7 batteries) can be replacedLCD battery symbol flashes when battery voltage is lower than 2.5VStatic current: less than equal 5UAsize:The hose is about 360mm longMaterial:Aluminum alloy + rubber + coppercolour:blackPackage Contents:1 * tire pressure gauge1 * 90 degree extension inflatable nozzle1 * threaded screw type air nozzle4 * tire valve caps1 * valve core opening tool1 * American inlet nozzle1 * Japanese air intake nozzle1 * sealing tapeOnly 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.