Submarine Thermometer

Brand: Marsh Bellofram Group of Companies

The Submarine Thermometer from Marsh Instruments offers both durability and performance, with a manufactured standard accuracy of 1% of span and temperature monitoring capabilities to 400° F (200° C).

Units feature a 5-inch v-shaped aluminum scale with black markings and a lens front, as well as a gray ABS case with a red spirit-filled reading tube and magnifying lens for readability. The thermometers also feature a 2″ nominal stem length for 3-1⁄4″ OA socket and a white aluminum scale with bold black graduations and figures. 

These thermometers are commonly used in space constrained applications such as diesel engines, steam turbines, reduction gears, pumps, condensers, boilers, chillers and pipelines.
  • 5″ scale size.
  • V-shaped aluminum scale with black markings.
  • Lens front, red spirit-filled reading tube.
  • Gray ABS case.
  • 2″ nominal stem length for 3-1/4″ OA socket.
  • Each thermometer is manufactured to a standard accuracy of 1% of span.



  • ± 1 % of Scale Range

Indicating Column

  • Red Liquid fill


  • Dual Scale °F & °C
  • White Coated Aluminum

Scale Length

  • 5 inches

Case Material

  • Gray ABS


  • Glass

Connection & Stem

  • 3/4”-28 swivel nut, for use with separable socket (Thermowell).

  • Diesel engines
  • Steam turbines
  • Reduction gears
  • Pumps
  • Condensers
  • Boilers and chillers


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