HyLids - Analog - Regular Mouth (2 3/4") Hygrometer Lid - FREE SHIPPING (USA)

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HyLids hygrometer lids fit on regular and wide-mouth Mason canning jars. You are now able to monitor and adjust the relative humidity(RH) inside a jar and make adjustments as needed.


2 piece Analog HyLids hygrometer wide mouth lid w/outside ring.

Calibration Instructions