Measures both pressure and temperature on the same dial. Dual scale. Extension Back connection. Brass wetted parts. 2" Stems. Ranges are compliant to industry standard ASME boiler code section IV. Hot water and steam pressure for boilers. Dial: 2.5" aluminum, painted white. Case: steel, painted black. Lens: plexiglass. Ring: acrylic, threaded. Stem: brass. Socket: brass. Tube: brass. Movement: brass and phosphor bronze. Sensing element: bi-metallic coil, bourdon tube. Pointer: aluminum, anodized black. Welding: tin-alloy solder. Pressure limit: 75 percent of full scale range. Ambient temperature: 23 degree fahrenheit to 122 degree fahrenheit. Process temperature: 75 percent of full scale range. Accuracy: +/-3-2-3 percent, +/-3 percent of full scale. Enclosure rating: IP50. Temperature range: 70 degree F to 320 degree F. Pressure range: 0-75psi/kPa