hygrometer

[satomi325]

http://www.acurite.com/weather/therm...red-probe.html

many people use this one. can be found at walmart for $12. takes hot side, cold side and humidity on the cold side. food for thought much more acurate and cheaper than those.

Acurites are inaccurate. I've owned 4 and half of them were off 10 degrees F and/or 10% humidity.
While the sample size is small, 50% success rate for me isn't accurate or ideal....

For accurate hygrometers, I use a musical instrument grade dial. (same type I keep in my violin case)