Product review (5 stars): This one is for my RV.
I've had this for only a few days now.  I opened it shortly after it was received and placed it alongside an analog humidor hygrometer and a Netatmo networked indoor base ststion. Within a very short time the Extech was reporting the same humidity as the Netatmo. The analog humidor meter was reporting about 2% less humidity. The temperature on all 3 devices was within 0.4 degrees.  Easy to read large display on this device.

I like the detachable sensor on this Extech model. I bought this to use in my RV.  I can place the sensor inside various compartments and other spaces and position the display where I can read and monitor it.

Monitoring humidity within an RV is essential for comfort, health, and proper maintenance of an RV. This portable device will allow me to monitor the environment inside the RV, the compartment space underneath, or outside.  It calculates and displays the dew point too, which is necessary to know if you want to avoid condensation on your windows and such, especially in the evening as it cools outside.

I consider this an essential piece of gear for my RV and would not leave home without it. This one stays in the RV.