Tru-Flate Air Line Pressure Gauge * ? In addition to air, this gauge can be used for measuring water, oil and other fluids compatible with brass and bronze components * ? Features: shatterproof crystal, pressed steel case, and brass fitting; dual markings - PSI and Kg/cm2 * ? Nominal accuracy is 3-2-3% (+/- 3% in top and bottom third of gauge, +/- 2% in middle third of gauge) * ? Back mount; brass 1/4-18 male NPT fitting; 0-300 PSI range *