a) Oxygen pressure indicator b) Certificate:ISO9001:2008 c)Bourdon tube: Brass or bronze ... .05%accuracy 3.Diameter of outside:40mm=1.5'',50mm=2'', 60mm=2.5'',100mm=4'',150mm=6''. Otherwise,we can do ... 7.Temperature:-10~70°C 8.Certification:ISO9001:2008 9.Dial plate:Single and dual scale (psi, kpa, mpa, bar, kg ... the load measurement limit 3/4. Bourdon Tube Oxygen pressure indicator