Standard cards designed for monitoring the humidity levels in and around museum cases, artefacts, collectibles, and other areas.
The humidity level is indicated in 10% RH increments, from 10%-80%. The colour of the card changes from blue (drier) to pink (wetter) when exposed to a change in humidity within an eight hour period. Indicator spots are reversible, and pink spots will change back to blue when the volume of air has dried. The highest indicator spot should be blue before being put to use, and can be dried with a dessicant before use to achieve this condition if necessary.
Card size: 38 x 105mm
Quantity: 5 cards per pack