ASME B40.1 Grade B Accuracy Compliance ± 3-2-3 % of span Oil, Water, Air, Compressor, Hydraulics, HVAC, Gaseous & Liquid media that are not highly viscous or crystallizing and not corrosive or oxidizing to copper alloy parts Dual Scale: psi / bar with kPa guidance. Burdon tube type, Brass and Copper Alloy Wetted Parts, Glass Window Lens Chrome Plates Stee Case CARBO Instruments 2- 1/2" Pressure Gauge, Chrome Plated Steel Case, Dry, 0-60 psi/kPa, Back Mount 1/4" NPT, Water, Air, Compressor, Hydraulics, HVAC, Gaseous & Liquid media that are not highly viscous or crystallizing and not corrosive or oxidizing to copper alloy parts