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Extech  EzSmart Hygro Thermometer for iOS/Android Devices RHT3
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Extech EzSmart Hygro Thermometer for iOS/Android Devices RHT3

Extech Hygrometer for Android or iOS Smart Devices – Measures  Humidity, Temperature, Wet Bulb, and Dew Point, plus Time, Date and GPS coordinates EzSmart RHT3

  • $67.09
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  • Weight
    0.5 lbs
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Extech EzSmart Hygro Thermometer for iOS and Android Devices RHT3

Make your device even smarter with the EzSmart Hygro-Thermometer and free app from iTunes® and Google Play™ store!

Just plug in the Extech Ezsmart to your iphone or android device and your ready to take readings.  Takes quick, readings of Humidity, Temperature, Wet Bulb, and Dew Point, PLUS Time, Date and GPS coordinates.

Displays readings with the handy trend graph feature. (See Detailed Images Above)

Fully functional Hygro Thermometer for a fraction of the cost!

Compatible with:  iOS 6+, iPhone® 4+, iPod Touch® 4+, iPad® 2+, and iPad® mini, Android® Compatibility Samsung Galaxy S® 3, Galaxy S® 4, Galaxy Note 10.1; LG® G2, G3; MOTOROLA® Moto G, Moto E, and Sony Xperia® Z2

Extech Thermometer Hygrometer for Smart Phones Features:

  • Measures Humidity and Temperature simultaneously
  • Calculates Wet Bulb and Dew Point Temperature
  • Continuous graph plots Humidity and Temperature changes over time
  • 5 user-settable high/low alarms for both Temperature and Humidity
  • Four records — each contains 100 data points with Humidity, Temperature, Wet Bulb, and Dew Point, plus Time, Date and GPS coordinates
  • Post images directly to social media (Facebook® and Twitter™)
  • Complete with built-in sensor and protective connector cap with strap

RHT3 Hygro Thermometer Specifications:  (Range, Max Resolution, Basic Accuracy)

Relative Humidity:  20% to 95%RH; 0.1%RH; ±5% RH
Temperature:  -4 to 140°F (-20 to 60°C); 0.1°; ±1.8°F (±1°C)
Wet Bulb (calculated):  -4 to 140°F (-20 to 60°C); 0.1°
Dew Point (calculated):  -40 to 140°F (-40 to 60°C); 0.1°
Dimensions:  0.7 x 0.35 x 2.1" (18 x 9 x 54mm)
Weight:  0.25oz (7g)

Download the Extech ExView™ RHT App at or

NOTE: iOS/Android device not included

Click Here to See User’s Manual

Operating Instructions:

  • Download App to the iOS® or Android™ smart‐device.
  • Insert the RHT3 plug into the smart‐device input jack.
  • Using the probe, measure the temperature and relative humidity in the area under test.
  • Use the application to view the temperature and RH values (Dew Point & Wet Bulb temperatures are also calculated by the app.).
  • Read the app’s info menu for an overview of the available functions including Graph plots, Records, and Alarms. The info menu is also available in the settings on the app home page.

One Year Manufacture's Warranty 

  • Manufacturer
    Extech Instruments

Product questions

  • Mika Mack
    06/08/2019, 11:18 PM

    Is it also a data logger and can it be downloaded to excell or does it have a CVS

    06/10/2019, 10:33 AM

    Hi Mika,
    It is a datalogger but the results are not transferable outside of the Extech app.