humidity indicator card (Lead free)
* environmental-friendly, comply with ROHs
* Easy to use; easy to read;
* High precision

humidity indicator card (Lead free) tell at a glance if moisture within sealed containers or closed spaces is at an acceptable level. Cobalt-free HUMONITOR cards do not contain heavy metals. These cards help monitor desiccant activity and are ideal for use with desiccants in any application where moisture control is critical. Any color change from blue to pink (cobalt cards) or brown to azure (cobalt-free cards) indicates an unsealed container and/or damaging level of humidity. Has indicating element calibrated for a permanent accuracy of ±5% of relative humidity in each application. Adversely affected by water, steam, metals, and high temperatures. Reversible, but should be kept in sealed containers before use.
HUMONITOR humidity indicator card (Lead free) can be used in electronics packaging, optical instrument packaging, bulk packaging, and in preservation of sensitive components. 

HUMONITOR is a registered trademark of ONE STEP (DONGGUAN) PACKING MATERIAL CO., LTD.

ONE STEP provide customers all kind of humidity indicator cards :

one dots: 10%, 50%

three dots: 5%-10%-15%, 5%-10%-60%, 10%-20%-30%, 20%-30%-40%, 30%-40%-50%,.....

four dots: 10%-40%

six dots: 10%-60%......

customer cards with customer printings.