Quote Originally Posted by andyroof1979 View Post
I was just looking on amazon at these and wondered if they would work as well as a helix or hepastat.....for $20 a pop you cant go wrong!
They are nothing a like. Herpstats and helix are proportional controllers. They have no hysteresis and are very accurate probes (0.5ºC up or down) this unit is a on off unit, all of them have hysteresis. The accuracy is 2ºF up or down. Basically it is a hydrofarm controller, or zilla. They are ok for heavy enclosures where the spikes all on/off produce are regulated by the thermal mass of the set up. Comparing a proportional unit to an on/off is not reasonable.

This is an interesting unit, does anyone know the hysteresis of this? The better on/off units it is only 1ºF, some have an adjustable hysteresis. Others are quite a lot.