Quote Originally Posted by C2tcardin View Post
I have 2 of these and they are great. Two probes so you don't have to leave the unit in the tank. You can set temperature range alarms. I have one probe in the substrate under the hot side hide set to go off if the temp rises above 92 or drops below 85. The other probe I placed is the substrate under the cold side hide and it will alert me if the temp drops below 75or goes above 85. It also tells you what the recent high/ low temp was and when those temps were hit. Not bad for $22 bucks.
http://www.thermoworks.com/products/alarm/rt8100.html

I like this one, though I wish it had a humidity reading as well