Features: 1.The accuracy is within 1 PSI. The tire pressure gauge supports up to 200PSI and has 4 optional units: PSI, BAR, KG /CM2, KPA. 2.The digital tire pressure gauge is easy to calibrate the pressure, easy to read, 2?3s display test value. If there is no operation within 15 seconds, it will automatically shut down to save battery power. The data can be read clearly in the dark. 3.In addition to reading tire pressure, it can also deflate and inflate. When the tire pressure is extremely high, the bleed valve helps to vent the air. When the air pressure is too low, all you need to do is to connect the air compressors and press the "inflate" button, and then start to inflate the tires. 4.Using heavy?duty stainless steel, brass, thick silicone protective cover and heavy?duty rubber hose, which are rugged, corrosion?resistant and durable. 5.It helps to extend the life of fuel economy, reduce the burden on the vehicle and enjoy comfortable and smooth driving. Specification: Item Type: Tire Pressure Gauge Kit Material: Aluminum Alloy, Copper, Rubber Display Mode: LCD digital display Pressure Unit: PSI, KPa, Bar, KG /CM2 Measuring Range: 3-200PSI/14BAR/14Kgf/cm2 Measurement Accuracy: (3-100PSI) 1PSI, over 100PSI 2PSI Working Temperature: -20-60 Key Functions: Switch key (left), unit switch key (right) Working Voltage: DC3.1V (2pcs 1.5V AAA batteries) can be replaced when the battery voltage is lower than 2.5V, the LCD battery label flashes Battery: 2 x AAA batteries 1.5v (not included) Working Current: 3MA or less (with backlight); 1MA or less (without backlight) Quiescent Current: 5UA Scope of Application: Motorcycles, cars, small and medium passenger trucks, How to Use: 1. Unscrew the tire valve. 2. Fix the copper head of the instrument to the valve. 3. The device will display the pressure. 4. You need to find the air pump and the air tube to connect the air nozzle, and hold the handle of the product to inflate it through the inflator when the pressure is low, and vice versa. 5. After the measurement, unscrew the copper head and press the vent button to make the indicator change to 0.