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 Plated Steel Case