No need to worry about batteries with this analog inflator gauge, filled with liquid (silicone oil) that provides optimal accuracy, pressure spike prevention, and a cushioned tick to optimize the lifespan of the mechanical parts inside the gauge. This also has a deflate button for when you overshoot the pressure. It comes with a 15 in. hose and a Ball Foot Air Chuck, great for hard-to-reach valves. The dial gauge is fitted with a rubber boot which protects it from corrosion, impacts, and shocks. INCLUDES: Analog inflator gauge with rugged comfort-grip handle, shock-resistant protective rubber boot, deflate button, 15 in. hose, and chuck. (Assembly required.) CONSTRUCTION: No need to worry about batteries with this durable analog inflator gauge. Protective rubber boot to shield against impacts. Comfort molded nylon handle with coating is incredibly durable and ergonomic. Steel inflator trigger with separate brass deflation button for quick fine tuning in case you go past your target pressure. Solid brass fittings throughout provide long-lasting performance, with 1/4 in. NPT female air inlet (Milton 727 plug is recommended). DRIVE SAFELY: Maintaining proper tire pressures improves vehicle handling, reduces risk of tire failure, improves fuel economy, and increases the life of your tires. Assembled in USA Warranty: 1 year.