... left, right, center back, offset back6) Material: a) Case and rolling bezel: steel b) Bourdon tube: brass, phosphor bronze, stainless ... steel c) Connection: brass, stainless steel d) Dial and pointer: aluminum e) Window: glass, polycarbonate7) Pressure range: vacuum ... up a stringent quality control system and professional management team.If you are interested in any of our series, or have a ...