Control Company’s Traceable^® Humidity On-a-Card indicates both current and maximum humidity attained. Easy-to-read cards are ideal for use with chemicals, plastic bags, electronics, desiccators, and storage containers and easily monitor humidity levels in shipments, optics, and packaging.

Dual ranges are Current and Maximum. Current range is 0 to 100% relative humidity. Color changes from blue to lavender in increments of 10% RH. Reversible indicator changes color as the humidity increases and decreases. Readable to an accuracy of ±5% RH at 75°F (24°C).

Maximum relative humidity attained is indicated by highest numbered hole containing dissolved crystals which cause paper around hole to turn blue. Once dissolved, reading will not change. (For crystals to dissolve properly, humidity must be maintained at or above indicated value for a minimum of 24 hours).

To assure accuracy an individually serial-numbered Traceable Certificate is provided from an ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology).

Each card is individually sealed in a clear moisture-barrier bag with a Humidity Sponge™ desiccant to keep the card dry and provide for extended shelf life. Card size is 4 x 4 inches. Sold in packages of six cards.

For more information, visit www.control3.com.