Cobalt Chloride Test Papers for Water and Humidity, 100-Pack

This vial contains 100 cobalt chloride test paper strips for detecting the presence of water and measuring humidity levels. Each strip measures approximately 1.9" x 0.6". The paper turns light pink or white in response to moisture at 50% relative humidity and above, or upon direct contact with an aqueous solution. The paper returns to its original blue color when heated or when the surrounding air dries, making it reusable under certain conditions. The strips are useful for detecting water leaks in difficult-to-reach places and recesses. Keep the vial tightly sealed when not in use. Made in the USA.