HyLids Curing Bucket Lids are a great way to have confidence that your bulk food/herbs are not being damaged from excess moisture or from over drying. Each lid has a digital HyLids hygrometer that reads both humidity and temperature inside your 5 gallon bucket. The screw top lid allows for easy complete air exchanges and there's a venting hole that allows you to release small amounts of air for precision moisture control. Keep your grains dry and your herbs fresh by monitoring the hygrometer and adding or reducing the moisture as needed. Each lid uses Gamma Screw-Top lids that have been designed to seal your 5 gallon bucket. With the HyLids hygrometer with the built-in vent, you have the perfect bulk food/herb storage container.