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Cobalt-Free Humidity Indicator Cards - 30%, 40%, 50%. Protect your valuables with our eco-friendly humidity indicators.Unlike harmful cobalt chloride-based options, these cards utilise a safe, cobalt-free formula to accurately monitor moisture levels.Available in 30%, 40%, and 50% RH options, they offer clear colour changes for easy monitoring.Ideal for electronics, pharmaceuticals, food, art, and industry, these durable cards provide reliable protection against moisture damage. Enjoy cost-effective, sustainable humidity control with our innovative solution.