Air pressure and hydraulic pressure The series main contain follow general specification. Case Sizes: 1.5", 2", 2.5" Pressure Range: With range from 30inHg(vacuum) through 15000psi Bourdon Tube: With phosphor brone material, range from vacuum through 1000psi in C-form, range above 1500psi in helical, silver soldered Movement: With brass material Cases and Ring: With steel black or steel chome plated material case, with roll type, SUS304, polished Connection: With brass material, bottom mounting and backside mounting available, 1/8", 1/4", 1/2", 3/8"PT, NPT, BSP are the standard threads, available for suitable dial diameter Dials: Dials are uniformly graduated and have highly legible black markings. In single scale(psi, bar Kpa, Mpa, or kg/cm2) or dual scales as request Windows(Lens): Tempered glass Pointer: With a fixed pointer unless otherwise specified Accuracy: Standard by ASME B40.1 Options: With steel chromed U-clamp, custom dial face, special connections, e-mail us or our distributor your logo or draw for special connection