*) Extech RH390 Precision Dual Display Hygro Thermometer Psychrometer

Weather Stations – Extech RH390 Precision Dual Display Hygro Thermometer Psychrometer

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Extech RH390 Precision Dual Display Hygro Thermometer Psychrometer

Features and Specifications: Extech RH390 Precision Dual Display Hygro Thermometer Psychrometer

  • Measures relative humidity from 0 to 100% and temperature from -4 to 140° F (-20 to 60° C)
  • Accuracy ±2% from 20% to 90%; ±1.8°F (±1°C)
  • Dual display of humidity and temperature or humidity and dew point or humidity and wet bulb
  • Capacitance sensor responds under to humidity changes in under 30 seconds
  • Slim design with rubberized ides for better grip

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Dual Display Hygro-Thermometer Psychrometer

Precision meter measures relative humidity from 0 to 100 percent with an accuracy of ±2 percent RH and Temperature from -22 to 199 degrees F (-30 to 100 degrees C) with an accuracy of ±1.8 degrees F/1 degrees C. Capacitance RH sensor provides a response time of less than 30 seconds.

Additional Features

The dual backlit display of Temperature and Humidity can be switched to show Humidity and Dew Point (-22 to 199 degrees F/-30 to 100 degrees C), or Humidity and Wet bulb (32 to 176 degrees F/0 to 80 degrees C). Slim design with rubberized sides provides improved grip. Other features include data hold, Min/Max record, Auto Power Off and low battery indicator

What’s in the Box

Comes with carrying case, 9-volt battery, and user manual.


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RH490 Precision Hygro-Thermometer Psychrometer

Specifically designed for HVAC and water damage restoration contractors, this meter measures Temperature (-22 to 199 degrees F/-30 to 100 degrees C), Humidity (0 to 100 percent RH), Dew Point (-22 to 199 degrees F/-30 to 100 degrees C), Wet Bulb (32 to 176 degrees F/0 to 80 degrees C), and Mixing Ratio in GPP (grains per pound/grains per kilogram) 0 to 1120 GPP/0 to 160g/kg. Less than 30 second RH response time with 2 percent RH accuracy. Additional features: dual backlit LCD display, Data Hold, Min/Max, and a slim design with rubberized sides for better grip.

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HD500 Psychrometer with Infrared Thermometer

Psychrometer features an Infrared Thermometer for non-contact temperature measurement -58 to 932 degrees F (-50 to 500 degrees C) with 30:1 distance to target ratio. A built-in laser pointer identifies the target area and improves aim. A Type K Thermometer measures air and contact surface temperature from -148 to 2501 degrees F (-100 to 1372 degrees C). Additional measurements include: Relative Humidity (0 to 100 percent RH), Dew Point (-90.4 to 140 degrees F/-68 to 60 degrees C), and Wet Bulb (-6.88 to 140 degrees F/-21.6 to 60 degrees C). Measurements are displayed on a large triple LCD backlit display. Heavy Duty rugged double molded housing. Auto Power Off conserves battery life. USB port includes software. Comes complete with Windows compatible software with cable, Type K bead wire temperature probe, hard carrying case, and 9-volt battery.

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