4X4 Accu-gage Calibrated to meet ANSI B40.1 Grade B specifications, which is the best quality gauge typically used for tire pressure applications Heavy duty with thick rubber protective guard and 70 PSI. Made by G.H.Meiser- industry leader in all tire gages Built in air bleeder to reduce pressure in over inflated tires. Screws in easily and accurately to set the desired pressure Improve your gas mileage and gain a smoother ride. Lifetime warranty!!