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[100 Packs] Dry & Dry Premium Cobalt Free Humidity Indicator Cards(6 Spots) Special Packets Premium Quality(ISO 9001 Certified) OxygenYou are now bidding on Brand New 100 Pack of Cobalt Chloride Free Humidity Indicator Cards 10 60% 6 Spot(100 Cards) . Card Dimension : 1. 5"(3. 8cm) x 4. 5"(11. 5cm) Cobalt Chloride Free Premium Quality Eco Friendly Humidity Indicator Card 6 Spots Humidity Indicating (10% 20% 30% 40% 50% 60% RH) Clear Color Change Indicator Changes Green to Purple(Violet) Green(Dry) to Purple(Humid) Major Electronics Companies use this cards Free Shipping