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| What kind of thermometer should I get for reliable readings? (testing a fridge) |
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| Freesurfer:
I have a refrigerator and I am not sure if it is performing correctly. I also have some junk peltier mini coolers and such that would be interesting to try. So the solution is simple, grab whatever thermometer I have and stick it in there to take some readings. But oh, not so fast.. I have little faith in the various cheap window thermometers, weather stations and such. If you let them sit indoors in the same room overnight, the indoor and outdoor temperature readings are normally off by anywhere between 1-3 degrees. I put a weather station inside my fridge, which reads 9C, which is way higher than my suspicions are. Even if it may be correct, I have little trust in the device. So I wonder what options I have and what kind of thermometer I am looking for to get trustworthy readings. On the other hand I am not looking for some "industrial grade calibrated equipment". Just something that can take somewhat reliable and believable readings in perhaps the ~$50 range. Are multimeters with thermal probes normally okay for such readings? Or are there other affordable thermometers that are intended for taking occasional measurements with a slightly higher QC than those cheap window thermometers? |
| tv84:
A few weeks ago, a friend of mine bought this one and is very happy with it (he didn't bought calibration): https://www.termometros.com/en/ThermaGuard-high-precision-thermometer-for-fridge-monitorization-39.9-to-49.9%C2%BAC But above your price range... Don't forget to state what is your required precision. PS: You could buy a bunch of different $5 devices and see which ones you're happy with. :) |
| BeBuLamar:
For the refrigerator 2-3 degrees off isn't all that bad. I think the main problem is that the thermometer would take a long time to get the correct reading. |
| Bud:
Check the datasheet for your multimeter what accuracy it claims for temperature mode with the stock sensor. |
| mycroft:
You can use an interchangeable NTC with a specified accuracy better then 1/2 degree C and a DMM. For example https://us.rs-online.com/product/littelfuse/pt103j2/72244625/. No need for calibration. |
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