~ Ball and Kerr have been making food preserving jars for over 135 years. ~ HyLids use Ball/Kerr 2-piece hygrometer lids in their construction allowing you to monitor the humidity inside a jar and make any adjustments you may need. ~ Great for storing partially dried herbs at their peak for a prolonged period of time. ~ Available in Regular and Wide Mouth sizes with either an Analog or Digital hygrometer. ~ Calibration and adjustment instructions included.
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