Extech Dual Input Hygro-Thermometer Psychrometer – RH350

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This dual input meter measures temperature, humidity and dew point. With the added bonus of two Type K temperature probes for measuring high levels of heat and providing temperature differentials.

Extech Dual Input Hygro-Thermometer Psychrometer – RH350

With 2 Type K external probe inputs for superheated measurements plus a memory function


  • Superheat differential measurements: T1-T2, Air-T1 and T1-Dew Point
  • Backlit LCD displays 3 parameters: %RH and Temperature with either dew point, wet bulb or Type K temperature measurements
  • Switchable °F/°C temperature units with 0.1° resolution
  • Built-in RS-232 interface — uses optional Windows® 95/98/2000/ME/NT/XP compatible software
  • Unique sensor cap design twists to closed position for protection during storage
  • Stores up to 99 data points for future reference
  • Min/Max with time stamp and average
  • Data Hold, Auto power off
  • Complete with 2 general purpose Type K bead wire probes and 4 AAA batteries
  • 1 year warranty

This hygro-thermometer psychrometer is a highly accurate way to measure temperature, relative humidity and the dew point. It comes with 2 included external Type K probes for additional temperature measurements and the ability to compare and provide differential measurements.

This meter also has wet bulb measurements to help determine the relative humidity and dew point. This meter has everything needed to start testing immediately. Applications for this meter include monitoring temperature and humidity in greenhouses, warehouses, saunas, museums, storage areas and regular houses.

With the added ability to test superheated surfaces with the use of the Type K temperature probes. This is great for HVAC applications and monitoring of stoves and engine temperatures. Humidity is very important for living spaces as well, due to its ability to cause skin damage when too low and promote mildew or dust mite growth when too high. The RH350 Hygro-Thermometer Psychrometer User Manual is attached to this page to answer any further questions.


  • Humidity: 10 to 90%RH
    • Resolution: 0.1% RH
  • Temperature (internal): -4 to 122°F (-20 to 50°C)
    • Resolution: 0.1°
  • Temperature (external): -328 to 2498°F (-200 to 1370°C)
    • Resolution: 0.1°
  • Dew Point: -90.4 to 122°F (-68.0 to 49.9°C)
  • Wet Bulb: -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)

Unit Ship Weight: 1 lb

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