Skip to content

EzSmart™ Hygro-Thermometer Extech RHT3

The Extech RHT3 is an EzSmart™ Hygro-Thermometer for use with Android or iOS smart devices. The RHT3 comes with a free app from iTunes and Google Play for taking readings. Complete with a built-in sensor and protective connector cap with strap.


Dew Point -40 to 140 °F (-40 to 60 °C)
Dew Point Max Resolution 0.1°
Relative Humidity 20% to 95%
Relative Humidity Basic Accuracy ±5%
Relative Humidity Max Resolution 0.1%
Temperature (Air) -4 to 140 °F (-20 to 60 °C)
Temperature (Air) Basic Accuracy ±1.8 °F ( ±1 °C)
Temperature (Air) Max Resolution 0.1 °
Wet Bulb -4 to 140 °F (-20 to 60 °C)
Wet Bulb Max Resolution 0.1 °


Certifications CE
Dimensions 0.7 × 0.35 × 2.1" (18 × 9 × 54mm)
Warranty 2 years
Weight 0.25oz (7g)


Shipping is fast and FREE across the USA for all orders $199 or more. For more details about shipping see the full shipping page here.

We offer 30 Day Easy Returns. If you decide you don't need a product we'll take it back so long as it is in original and re-saleable condition. See the full details here.

Found a better price online? We'll match it or beat it if we can. 

All you need to do is let us know via phone or email ( and we'll let you know what we can do.

You will need to provide evidence of the better price online and it must include any shipping or taxes charged by that site. i.e. It needs to be the total price.

This only applies to new products, it does not apply to used condition products.