Product characteristics 1。 Dial size: 2&* 39； 2。 Metal structure, solid and durable. Material: copper, iron, aluminum, plastic, rubber. High-quality precision movement, achieving accurate measurement and durability 5. Rubber protective sleeve for protecting products 6. 360-degree rotating brass head, compact design 7. One-button deflation device is convenient for adjusting to the correct tire pressure psi, bar and kg/cm2 conversion psi unit bar kg/cm2 1 psi 1 0069 0.07 1 bar 14.5 1 1.02 1 kg/cm2 14.2 0.98 1 Mode D; Employment Unscrew the valve cover from the tire Insert The brass end cap of the pressure gauge enters the valve and is tightened The tyre pressure gauge will display the tyre pressure If the tire pressure is insufficient, inflate the tire; If the tire pressure is too high, press the exhaust valve to exhaust air The normal tire pressure for small cars is 28 psi to 35 psi After measurement, unscrew Brass end cap, press the purge valve Point the needle to zero and screw back