Reotemp Gas Actuated Thermometer From Reotemp Instruments Gas Actuated Direct Drive Accuracy: ± 1% of full scale. Calibration to NIST traceable standards. Dial Size: 4-1/2" satin finish aluminum, black markings Ranges: -350°F to 1200°F or °C Case Material: Stainless steel Case Styles: Panel Mount (remote), Surface Mount (remote), or Direct (stem) Mount. Windows: Gasket sealed glass or plexiglass Pointer: Micrometer adjustment type Capillary: Stainless steel protected by 1/4" diameter flexible SS armor or 3/16" diameter plain armor Bulb: Stainless steel welded construction, 3/8" diameter Actuation: Nitrogen thru stainless steel direct drive bourdon coil for high vibration