Adsorbco HIC-1 Humidity Indicator Cards 20 Pack (Reusable) (6 Spots 10%-60%)

["Clear Moisture Detection at 8% RH – This humidity indicator card is designed to visually signal moisture exposure by changing from blue (dry) to pink (wet) at 8% relative humidity. No batteries needed!","Compact & Easy to Use – Small and lightweight (38mm x 50mm), easily fits into drawers, storage boxes, or sealed containers. Simply read, check, and replace as needed.","Wide Application Coverage – Ideal for gun safes, camera storage, medicine boxes, coffee beans, cigars, and other moisture-sensitive items. Protects your gear and valuables.","Instructions Included – Place in a sealed container, wait 30 minutes, check after 24 hours. If blue turns pink, replace desiccant. Simple, visual humidity control."]