Extech RH350 SuperHeat Psychrometer

Extech RH350 SuperHeat Psychrometer


The Extech SuperHeat Psychrometer has two type K external probe inputs for superheat plus a built-in memory that stores up to 99 data points.


  • Superheat differential measurements: T1-T2, Air-T1, T1-dew point
  • Dual type K external temperature probe inputs (T1, T2)
  • Built-in RS-232 interface
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The Extech SuperHeat Psychrometer simultaneously displays % relative humidity, temperature, and dew point or wet bulb or external temperature probe. The superheat differential measurements are T1-T2, Air-T1, T1-dew point, and the dual type K external temperature probe inputs (T1, T2). The unique sensor cap design twists to closed position for protection during storage.


The meter retrieves max/min readings with data and time plus average function. The built-in RS-232 interface uses the optional compatible software to connect to a PC for futheranalysis of data points. Additional meter features includes switchable °F/°C temperature units with 0.1° resolution, real time clock, automatic power off, and data hold that freezes current readings on the display. 

Notable Specifications:
  • Humidity range: 10 to 90%RH
  • Humidity maximum resolution: 0.1% RH
  • Humidity basic accuracy: ±3% RH
  • Temperature (internal) range: -4 to 122°F (-20 to 50°C)
  • Temperature (internal) maximum resolution: 0.1°
  • Temperature (internal) basic accuracy: ±1.8°F or ±1°C
  • Temperature (external) range: -328 to 2498°F (-200 to 1370°C)
  • Temperature (external) maximum resolution: 0.1°
  • Temperature (external) basic accuracy: ±0.3% or ±1.8°F/±1°C
  • Dew point range: -90.4 to 122°F (-68.0 to 49.9°C)
  • Wet bulb range: -6.9 to 122°F (-21.6 to 49.9°C)
  • Dimensions: 9 x 2.2 x 1.7" (230 x 57 x 44mm)
  • Weight: 5.3oz (153g)
What's Included:
  • (1) Psychrometer
  • (2) Type K bead wire temperature probes
  • (4) AAA batteries
Image Part # Product Description Price Stock Order
Extech RH350 SuperHeat Psychrometer RH350 SuperHeat psychrometer
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Extech RH350 SuperHeat Psychrometer RH350-NIST SuperHeat psychrometer, NIST traceable
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Image Part # Product Description Price Stock Order
Extech RH350-CAL Humidity Solution Kit for RH350, 33% and 75%
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Extech 589250 RS232 PC Cable for RH350, RH355, 42582
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