Silica Gel 4LBS Indicating Silica Beads (Blue to Pink) Reusable Desiccant

Simply check the color of the indicating silica gel desiccant to see if they have changed from blue to pink. 【Indicating Silica Gel 】: Wisesorb blue indicating silica gel (2-4mm in size) are designed to change color within a humidity range of 20%-50%.

eBay