Bad reading on temp probe?

[cub21rak]

Ok so I've got my reefkeeper running and everything's connected to it. I've been using this to read my temp (it plugged into my sl1 via the phone jack style plug)

I wanted to not have it connected to via the phone jack plug so I got a new temp probe that uses the molex plug (special type plug that plugs into a different port on the sl1) and this is what it looks like.

So with the first temp probe I was getting a temp reading of 78.5 deg. I have my heaters set for 77 so they currently weren't on.
Then I unplugged that and plugged in the new temp probe. And now the temp is reading 74.5. Weird
So I went and found 2 thermometers that you float in the tank to test it that way to. I have them both floating in the sump where the temp probe is at too. Both of those seem to be reading the same 74/75 deg that the temp probe is also reading. Do I assume the new temp probe is correct and the old one wasn't reading right?

 

[Vinny Kreyling]

I have a "precision thermometer" by Tropic Marin I use when needed.
I also have a hand held laser unit I can use.
Actual temperature is not as necessary as stability of it, 2 degrees here or there is not a problem unless @ the upper or lower limits of the norm.
I would try a better thermometer.

 

[cub21rak]

Well as of today, the new reefkeeper temp probe and the 2 thermometers are all stil reading same temp. Looks like the old one wasn't reading right.