How Humidity Indicators Work
Humidity indicator cards contain chemical spots that change color from blue to pink when exposed to humidity. A quick look at the card will indicate the humidity level of whatever you are packaging.
Each card features several dots, each calibrated to a specific relative humidity level such as 30%, 40% or 50%. As humidity rises, the dots change color, providing a clear visual signal that moisture has entered the environment.
When placed inside a sealed container or moisture barrier bag, these cards allow you to verify that your desiccant and packaging are doing their job. This simple tool provides an immediate, low-cost way to monitor storage conditions.
Types of Humidity Indicator Cards
At Edco, we offer a range of humidity indicator options to meet the needs of different industries and packaging configurations. We supply three-, four- and six-spot cards, as well as indicator plugs for flexible barrier bags, giving you options depending on your monitoring requirements.
Common Uses for Humidity Indicators
Humidity indicator cards are essential in industries where even minor exposure to moisture can cause damage. For example, in the electronics industry, they protect circuit boards, sensors and components from corrosion. Aerospace and defense manufacturers rely on them to safeguard precision instruments during storage and transit. They’re also widely used in medical, optical and industrial applications that demand consistent environmental control.
When used with desiccants and moisture barrier bags, humidity indicators complete a dependable moisture protection system. Each element works together to keep your sensitive materials dry and compliant with strict quality standards.
Why Choose Edco Supply Corporation?
Since 1954, Edco Supply Corporation has been a trusted source for military specification packaging. We represent all major qualified manufacturers and maintain one of the largest inventories of moisture control products in the country. Our customers count on us for fast lead times, small custom projects and responsive service that larger suppliers often overlook.
We understand the needs of military contractors, industrial shippers and electronic manufacturers who depend on reliable moisture protection. When you buy humidity indicator cards from Edco, you get a product that meets exacting standards backed by our dedicated team.
Order Humidity Indicator Cards Today
Protect your products from costly moisture damage with high-quality humidity indicators from Edco Supply Corporation. Call us today at 646-212-0884 or fill out our contact form online to request a quote and learn how our moisture indicator solutions can keep your materials safe and compliant. If you’ve never used humidity indicators before, we can help you choose the right solution.
