1The accuracy is within 1 Psi. The tire pressure gauge supports up to 200PSI and has 4 optional units: Psi, Bar, Kg /CM2, Kpa. 2The 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. 3In 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. 4Using heavy?duty stainless steel, brass, thick silicone protective cover and heavy?duty rubber hose, which are rugged, corrosion?resistant and durable. 5It helps to extend the life of fuel economy, reduce the burden on the vehicle and enjoy comfortable and smooth driving.