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ectoplasmosis-
I've got an Elitech RC-51H logger which has a display and came with a calibration certificate
https://elitech.uk.com/products/rc-51h
Other things with QC process that are documented are available.
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what do I buy?
Include the word "calibrated" in your search, you can get a hygro-thermometer of known accuracy for under £100
jellybaby
gbj_tester
Had this recently with baby bath thermometers. 4 different units from 3 different brands giving different readings. Useless.