bartoli

How do you establish the accuracy of the baseline thermometer (be it glass or digital)?

Nevermore

Well, mine and the VWR one are calibrated and tested against standards traceable to the National Institute of Standards and Technology and were found to be accurate to within +/- one scale division for temps below 230 F. It comes with a certificate and a serial number, from there I take their word at it.

bartoli

To establish the accuracy of the glass thermometer, I checked it against the reading of the room temperature thermometer. They both gave the same reading.

Then I dipped the glass thermometer into tank water and placed it alongside the probe of Tom Aquarium Temperature Alert. They both gave the same reading. To me, that means the Tom Aquarium Temperature Alert is very accurate.

bartoli

I got mine from a local Petsmart. May be you can pick one up as well.