Did you end up going with any particular product?

My server room AC failed early Monday morning, and my ad-hoc temperature sensor failed before my threshold, so I never got notified.

Until someone came in Monday morning and noticed that there was something funny going on. The server room got up to 140°F (60°C). Holy crap.

So now my manager wants triple redundancy on the climate monitoring.

I'm inclined to go with the ITWatchdogs products — they seem to be well respected — but the fact that they have external power supplies, and direct plug-in ones at that, turns me off. I don't know that I need more than just the one, though, so maybe the PoE module would work fine for me.

Anyway, just thought I'd see if there was any new information.