Dri-It HC-00-10 Humidity Indicator Cards A simple, low-tech way to see if you have a humidity problem in your home. It also shows if your humidity solution is working The HUMIDITY INDICATOR CARD reveals the relative humidity in enclosed spaces using easy- to-read terms: Damp, Humid, or Dry A Convenient Package of ten cards, each individually sealed, to place throughout the home: closets, under sinks, attics, basements, storage lockers Know the extent of your humidity problem and where you need a solution before your property gets damaged Proudly made in the USA