Unique humidity card indicates both the real time humidity and the maximum humidity attained. Easy-to-read cards are ideal for use with bottles, chemicals, plastic bags, electronics, desiccators, and storage containers. Easily monitor humidity levels in shipments, optics, and packaging.
See Humidity in Real Time; Colors change as humidity rises and falls Dual ranges are Current and Maximum. The Current or Real Time range is 0 to 100% relative humidity. Color changes from blue to lavender in increments of 10% RH. This Reversible indicator changes color as the humidity increases and decreases. Readable to an accuracy of ±5% RH at 75°F (24°C).
Shows maximum RH% reached Maximum relative humidity attained is indicated by the highest numbered hole containing dissolved crystals. Dissolved crystals will cause the paper around the hole to turn blue. Once dissolved, the reading will not change. (NOTE: for crystals to dissolve properly, the humidity must be maintained at or above the indicated value for a minimum of 24 hours). Each card is individually sealed in a clear moisture-barrier bag with a Humidity Sponge desiccant to keep the card dry and provide for an extended shelf life.