Pro Analog Pistol Grip 230PSI Inflator Gauge – 36″ Hose and Ball Chuck w/Clip – 230 PSI 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. Resolution: 2 PSI Diameter: 2.75″ Units of measure: PSI (0-230), Bar (0-16) Liquid filled: silicone based oil Hose: 1/4″ ID x 36″ EPDM rubber w/ brass fittings Operating temperature: -4 to +158 degrees F (-20 to +70 C) Air inlet: 1/4″ NPT female