- Joined
- May 22, 2016
- Messages
- 6,545
- Reaction score
- 10,102
I have a calibrated thermometer that I use to calibrate my other thermometers.
Or alternately, use a cheap swing-arm, because they are temp-self-correcting.
They are very tightly repeatable, so the measurement is however good the calibration solution was that I made (from Randy's article) to make my mark on the swing-arm.