thermometer question

[saltcreep1025]

I have three thermometers... one digital two of the normal kind, and all three show slightly different temps. Is there any way to figure out which one is right?

 

[Flaxon-Waxon]

I have three thermometers... one digital two of the normal kind, and all three show slightly different temps. Is there any way to figure out which one is right?

I had the same issue, and I chalk it up to OCD, and eventually tossed 2 of them. Are they in different parts of the tank, or close together?

 

[chbix]

I have an aquacontroller 3 with temp probe, the dt has one of those cheap color change temp things on the side. I noticed that my heaters were not kicking on at the right temps per my program. So I bought 3 digital temp probes. Put one in the dt and one in the sump with my ac3 temp probe. I found my ac3 was off by about 2 degrees and I see a regular variance of about 1 degree between the dt and sump.