20 Premium Humidity Indicator Cards(REUSABLE More than 20 Times) - Cards should not be in Direct Contact with Foods or Medications</br>When You Initially Open the Card All Dots Sometimes React and Change Color Because They are Exposed to Sudden Humidity. If You Wait for About 30 minutes the Card will Calibrate and You will be able to Read the Humidity Level. - 6 Spots Humidity Indicating(10%/20%/30%/40%/50%/60% RH - Clear Color Change)</br>Strictly Tested for Clear Color Change.- Indicator Changes Blue to Pink - Blue(Dry) to Pink(Humid)</br>Our Humidity Indicator Card is the highest quality in the industry for Humidity Measurement.</br>CONTINUOUSLY & ACCURATELY Displays Humidity Level - If the humidity level becomes lower the strip will change back to blue (the original color). Just because the color has changed to the next level does not mean it cannot go back to the previous color. The colors will change depending on the humidity level. Colors may fade with long term use of more than 20 times.(See Our Customers' Review)</br></br>Product Description</br></br><b>DRY & DRY - OUR PRODUCTS</b> <br>"Dry & Dry Humidity Indicator Card is Premium Quality. <br>"It is strictly tested for clear color change <br>?When you initially open the card?? all dots sometimes react and change color because they are exposed to sudden humidity. If you wait for about 30 minutes?? the card will calibrate and you will be able to read the humidity level. If 10