Indicator Card Suppliers
Humidity Indicator Cards are lot-traceable cards printed with moisture sensitive spots that respond to various humidity levels by turning blue or pink. The cards measure the level of relative humidity that the contents of the packaging have been exposed to.
Any color change from blue to pink (cobalt cards) or brown to green (cobalt-free cards) indicates an unsealed container and/or damaging level of humidity.
Cards can be used in electronics packaging, optical instrument packaging, bulk packaging, and in preservation of sensitive components.
Established in 1998, Chunwang is well-known as one of the leading manufacturers and suppliers of indicator card suppliers in China. During the past two years, we have introduced advanced equipment and technology into our factory. Please be free to buy our cheap products made in China.