HyLids have a analog hygrometer built into the lid of a wide mouth canning jar lid. You can now keep your partially dried organics at the highest quality for the longest time by watching the moisture level to prevent over drying or spoiling. They are ideal for monitoring your dried herbs, fruits, or wherever your imagination takes you. Use them for storing herbs and assist in the curing process. Each lid comes with a ring for the ideal seal. Jar not included. For every 5 HyLids purchased at the regular price of $11.99 each you’ll receive the 6th for FREE!