I'd like to have a temp controller for my cooling fan. Right now I just have it run when the lights are on.
$25 but it would need the wiring to be reversed somehow. It's designed to control a heater, rather than a cooler.
$58 and I think it would work out of the box. Only goes up to 80F but that's fine with me.
Sure, these aren't digital and don't have LCD displays but do I really need that? Once it's working, it's going to sit behind my tank and never be seen.
Lastly, there is this digital one with LCD display but it requires some DIY wiring.