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[100 Packs] Dry & Dry Premium Cobalt Free Humidity Indicator Cards(6 Spots) Special Packets 30+ Year Experience in theYou 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