Professional Grade Pressure Gauge. One piece design for toughness during installation. Measures air pressure, water pressure, fuel pressure, gas pressure, oil pressure, anything not corrosive to brass. Liquid filled for added durability in applications where vibration is present. Stainless steel case and bezel, copper alloy internals. ¼” Male NPT Bottom Connection. 0 to 3000 PSI Pressure Gauge, Dual Scale PSI & Bar Scale, 2.5” Dial, 2-1-2% accuracy, Made to ASME B40.100 standard.