Most Accurate Thermometer

[Nick30G]

What is the most accurate thermometer out there to monitor my new reef tanks temperature? I dont want something that is off by 3 degrees, something within 0.5 degrees would be good. I want to make sure my tanks tempature is accurate and not off by several degrees!

 

[heathlindner25]

The old school glass thermometers

 

[smatter]

Tropic Marin makes a nice glass thermometer.

 

[erik921]

The old school glass thermometers

Just going off of what they sell on McMaster -- most glass thermometers are +/- 2°F

Although here's one that is good to +/-1°F for ~$18:
https://www.mcmaster.com/#38935K41

I was just looking today for a good digital one myself for calibration purposes. Here's a water-resistant digital one at +/-1°F (~$30):
https://www.mcmaster.com/#8058K22

The best I could find was this one at +/-0.4° (for ~$60), but the form factor wasn't exactly what I was looking for (this one is a little long, but would probably work):
https://www.mcmaster.com/#3569K58


If you're looking for something to monitor temperature on an ongoing basis, you might want to check out the heater review section on BRS's 52 weeks of reeking:
https://www.youtube.com/watch?v=8vrSO8WLs_M

Some of the heaters they tested maintain the temperature very very precisely in a narrow band, though the accuracy may be off (which you can calibrate with one of the thermometers above).

Also of course an aquarium controller, like Apex, with a built in temperature sensor (which again will need to be calibrated)




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[newyorkerx]

ThermaPen

 

[Nick30G]

I would like something to monitor at glance on a ongoing basis. Also going to need something to calibrate my two Eheim Jagers to make sure they heat the tank up to my accurate desired tempature.

 

[erik921]

Something like this might be good if you want constant monitoring, but it's only good to +/-2° (found this on another reefcentral thread):

https://www.coleparmer.com/i/digi-s...be-thermometer/9000041?searchterm=EW-90000-41

Here's one that says it's +/-1°. Quite a few more options at that accuracy range. It says "Stainless-steel probe is resistant to most acids, bases and solvents" - but I'm a little wary of stainless in salt water:
https://www.coleparmer.com/i/digi-s...-probe-digital-thermometer-waterproof/9020522

I'm thinking of doing something like this at +/-0.4°. The products start to get pretty sparse and very expensive for anything much more accurate than this:
https://www.fishersci.com/shop/prod...otective-guard-8/1464812#?keyword=thermometer

 

[thegrun]

I have an old lab grade mercury thermometer that I use to calibrate all my other thermometers.

 

[Valentini89]

Get an Inkbird. It'll keep your temp controlled. They're only $45 on Amazon.

 

[Nick30G]

Get an Inkbird. It'll keep your temp controlled. They're only $45 on Amazon.

Would i just plug in a power strip into the inkbird for a extra heater as i have two? And also does the Inkbird require calibration from another thermometer?

 

[Dugless]

I'm not sure the pinpoint accuracy will matter as long as the thermometer is consistent, since ultimately that's what one should strive for.

 

[Potatohead]

Three of them. Plus an Inkbird .

 

[LQT]

ThermaPen

One of the best cooking tools ever. I love mine!

 

[Valentini89]

Would i just plug in a power strip into the inkbird for a extra heater as i have two? And also does the Inkbird require calibration from another thermometer?

Inkbird does not require calibration, and I would assume you could safely plug in a small strip, like a two-outlet. That's all you would need anyway.