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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.
1 pack per 25 cigars in humidor would have been nice to know prior to ordering. i got 5 more on the 2 day mail. amazing, new humidor and bovida 84s are increasing the humidity. i was about to give up! thanks dave.
My first test with this we 3 Caliber IV digital hygrometers by Western Hygrometer. Convenient that all fit in at once. After 24 hours 2 read 75% and one read 72%. Instead of re-calibrating at that time, I let it go another day. After 48 hour, the 2 were still at 75% and the other had moved to 74%. At that point I assumed it was done and re-calibrated. Have since used on others. If you are looking for a simple solution and have 8 bucks to spare, this is it. Highly recommend.