High Precision The Longruner gauge is made of durable metal and the waterproof design, for precise measurement. With professional calibration, always keep a reading within 1% of your exact tire pressure and a display resolution of 0.1. No more guessing! Accurately measures a range of 0 200 psi. Leak resistant and valve extension design Genuine brass air mandrel provides excellent seal on the tire valve outside the car tire and free your hands to use the tire pump. 1/4 NPT quick connect male fittings are all integrated in one unit. The 90 degree valve extension allows to connect the hard-to-reach tire valve inside the car tire. 3-in-1 multi-function design Designed to check tire pressure connect air pump to inflate the tire will inflate the air if the tire pressure is high. also a tire inflator to inflate the tires when connecting an air compressor. A tire deflator to quickly evacuate over-inflated tires by pressing its air purge valve. Battery saving turns on automatically and turns off automatically after 20 seconds of inactivity to preserve the duration battery life Built-in air bleeder valve to quickly reduce pressure in over-inflated tires. Increased Safety Correctly inflated tires provide better performance in all weather conditions, thus reducing the likelihood of pairing, explosions and accidents. Increase your MPG and save money on fuel costs and tire wear. The tire pressure gauge can be applied to different types of vehicles: construction vehicles, trucks, racing, HGV, SUV, vans and cars.