RH401: Digital Psychrometer + InfraRed Thermometer

  • Triple display with backlighting
  • Displays Air temp+RH+surface temp or Dew Point+RH+surface temp or Wet Bulb+RH+surface temp
  • Built-in InfraRed Thermometer with laser pointer and 8:1 distance to target ratio
  • Adjustable emissivity from 0.3 to 1.0
  • Precision humidity capacitance sensor is retractable for protection during transportation and storage
  • Calculates T1 (IR Surface Temperature) – DP (Dew Point) differential
  • English Datasheet
  • English User’s Manual
  • Download Software
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Humidity, Wet bulb, Dew Point, Air Temperature plus Non-contact IR Temperature

The RH401 is a Digital Psychrometer with a Built-in IR thermometer that allows quick non-contact surface temperature measurements. Displays air temperature, humidity and surface temperature or dew point, humidity and surface temperature or wet bulb, humidity and surface temperature on a triple LCD with backlighting. The IR thermometer features adjustable emissivity and a spot/distance ratio of 8:1. The meter calculates the temperature difference between IR surface temperature and dew point. Ideal for spotting potential areas with mold. Other features include data hold, programmable auto power off and a retractable probe that protects the sensors when the meter is not in use. Includes hard case and four AAA batteries.

Specifications Range Max Resolution Basic Accuracy
Humidity 10 to 90%RH 0.1% RH ±3% RH
Temperature (internal) -4 to 122°F (-20 to 50°C) 0.1° ±1.8°F or ±1°C
Temperature (external) -328 to 2498°F (-200 to 1370°C) 0.1° ±0.3% or ±1.8°F/±1°C
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)

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