Humidity Indicator Cards 30 to 50% 3 Seater Pack of 50

• Country of Origin: China
• Size: 2.5 x 5.1 x 10.2 cm.
• Material: paper.
• No assembly required.

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!