I have the Credo and it can not be calibrated manually. As far as I know, digital hygrometers do not need calibration. With the Credo, you can take out the battery, put it back it, and the Credo will calibrate itself and give accurate recordings. It is still a good idea to do the salt test on the Credo using the Boveda test so you will know exactly what your humidity level is from the hygrometer recording.
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