Integra Boost Humidity Indicator Cards have a 10% - 60% relative humidity range and are a simple, fast and effective way to visually verify the integrity of your product. Excellent for home/hobby use, as well as for a business to boost their customers' confidence in your product line. Perfect size for putting in a glass jar or other storage device. Use in conjunction with Intregra Boost Humidiccant humidity control packets (also available). Includes 10 indicator cards.