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.
Included:
2 piece Analog HyLids wide-mouth hygrometer lid w/outside ring.
Calibration Instructions
I'm very happy with their service, item arrived in a timely manner and was well packaged. I absolutely love these hygrometer's, they come pre-calibrated and when checked against a calibrated reference, they're spot on. I will be purchasing more in the future.
Very happy to use these on my seed storage jars along with silica gel packets. Thank you.
