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Boveda EZ One Step Calibrating Kit
Works perfectly. Followed easy directions. 24 hrs later my humidor had the right humidity. Very Pleased.
This is the best way to calibrate a hydrometer. It takes out all the guesswork and trial & error.
used these before .they worked perfectly. very easy to use.no guess work.
It’s the simplest and most reliable method to calibrate hygrometers and the absolute easiest.