http://www.hydrofarm.com/pb_detail.php?itemid=3372
I ordered this after someone mentioned it in another thread and couldn't be happier with it. I've been wanting a thermostat to use on my incubator but haven't wanted to spend $100 so when I saw these for $25 I decided to give it a shot. Its the on off type and kicks off at what you set it at and back on 2 degrees lower. So if you set it at 90 it will heat up to 90 and shut off then kick back on at 88. so far it has been accurate and is working good. I think its a great deal for the money and wanted to share.