Product review (5 stars): I bought three-great household tool
I recently became interested in the humidity indicator, and I found E10 to be the most affordable without having too small of a display.  So far, it's been nice to have it in our bedroom, and although I bought three, I ended up giving two away.  The recipients really liked it.

Pro:  Large enough display.  Simple.

Con:  Wish it had a light button or something to see at night.  I often check the indicator to check the room temp and humidity level (although the humidity level doesn't fluctuate too much despite my humidifiers).

This is a great buy, and I would buy more in the future...