I know this has come up in the past but it's just a reminder that sometimes you need to double check things.
Over the weekend my reef fluctuated from 74-86 in the course of about 30hrs. Turns out that one of two mercury glass thermometers was out by a whopping 5 degrees! and the second was reading correctly but I didn't know which to go by until I ran the check, I trouble shot my heater to make sure that it was functioning ok.Then used 3 different thermo's including infared to see which one was out. I ran a pinpoint probe on my last reef so i guess this gives me an excuse to go shopping. Lucky all livestock and corals look good.
So I'm curious as to what all you folks are running for thermo's: digital, mercury, or digital probes
