a) Bourdon Tube Oxygen manometer b) Bourdon tube: Brass or bronze c) Thread: Brass d) Movement: Brass OXYGEN PRESSURE GUAGE Features:Oxygen pressure gauges for measuring the pressure of oxygen medium, forbidden contacts grease-like substances.Specification:1.Type:YO2.Accuracy:Normal Grade 2.5, 1.5 1.0 0.05%accuracy 3.Diameter of outside:40mm=1.5'',50mm=2'', 60mm=2.5'',100mm=4'',150mm=6''. ...