Jack Reilly
Member
One reads 24 one reads 22 and one reads 21. I left them in there for half an hour, gave them all a gentle tap with finger etc but their readings are steady. I even held the two smaller ones lower in the tank to see if that accounted for the difference but it didn’t. Isn’t this a lot of variation amongst the same thermometers? I run my tanks at 24 so if it’s in fact 21 that’s pretty chilly.... how do I know which one is accurate ?