Mason Jar Hygrometer Lid
thingiverse
I designed this Mason Jar lid to fit any widemouth jar, and allowing adding a hygrometer to be placed. (like this one https://www.amazon.com/Goabroa-Hygrometer-Thermometer-Temperature-Fahrenheit/dp/B07QC7JRDP/) You can fit it by pressure, it will be a tight fit, or you could add hot/cold silicone to seal it around the hygrometer. It works great to preserve herbs, and monitor the RH %. Donations: https://www.paypal.com/paypalme/ilivov
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