This six dot card changes colour on a scale of 10%, 20% ,30% ,40%,50%,60% Humidity Indicator Cards ... Cards help monitor desiccant activity and are ideal for use with desiccants in any application where moisture control is critical. ... 20, 30% This three dot card changes colour on a scale of 10%, 20% 30%,40% ,50%,60%to indicate ... crads per tin Humidity Indicator Cards (HIC) cobalt-free with 6 poit