HyLids Curing Bucket Lids are a great way to have confidence that your bulk foods are not being damaged from excess moisture or over drying. Each lid has a digital HyLids hygrometer that reads both the humidity and temperature inside your 5 gallon bucket as well as a venting hole to release small amounts of air to achieve your desired moisture/humidity level inside. Keep your grains dry and your herbs fresh by monitoring the hygrometer and adding or reducing the moisture. Each lid uses Gamma Screw-Top lids that have been designed to seal the bucket and provide a screw top lid. With the HyLids hygrometer and a built-in burp vent, you can cure to perfection and store with confidence.