Wholesale Humidity Indicator Card - 3 Dot 30%/40%/50% - MS20003-2

50 Cards Per Pack: If you need 50 cards, order quantity 1. If you need 200 cards, order quantity 4. This is a Color-Change Reversible Humidity Indicator Card that meets the requirements of Military Specifications MIL-1-8335 and MIL-P-116 Method II. This Indicator Card has 3 indicating spots (30/40/50% RH), they change from Blue (dry) to Pink (humid). A great tool to assist you in keeping your valuables protected!