Pressure Gauge Liquid Filled Dial Size (In.) 2-1/2 Range 0 to 30 psi Dial Size (mm) 63 Connection Size 1/4 in NPT Connection Location Lower Smallest Graduation (PSI) 0.5 psi Accuracy ( Percent) 2-1-2 Case Material Copper Alloy Case Color Gold Socket Material Copper Alloy Tube Material Copper Alloy Filled With Glycerine Lens Material Polycarbonate Ring Material Forged Brass Operating Temp Range (F) 30 Degrees to 160 Degrees F Available Separately Calibration Certificate