How the Test Strips Work:
These economical test strips consist of paper saturated with cobalt chloride. The test strips show high relative humidity or the presents of water by changing from blue to pinkish-white. Cobalt chloride is a hydroscopic salt compound and exists in two forms. The anhydrous cobalt chloride salt is blue and the hydrated salt is pink. When the hydrated salt is gently heated, the blue anhydrous salt is reformed.

How to Use the Test Strips:
Simply store a test strip in the same container or barrier packaging you wish to monitor. Use with our molecular sieve desiccants to indicate the sieves are saturated and need to be dried. Always keep the test strips well sealed in their vial since exposure to 55% relative humidity or greater is sufficient to cause a slow color change.

How to Reactivate:
Remove the test strips and dry in an oven warmed to 104ºF
(40 ºC). Note: The test strips can be reactivated as long as cobalt chloride has not migrated from the paper strip due to oversaturation.