The Humidity Indicator Card (HIC) is a kind of visible card. Each dot on the card points one special relative humidity degree. The dot color will change along with the RH degree from blue to pink (common cobalt-containing HIC) or brown to green (cobalt-free HIC). This changing helps users decide the inside RH degree and confirm whether the desiccant should be replaced or not. Special specification can be customized. The commonly-used types are 5-10-60%, 30-40-50%, 10-60% and so on.
1) Cobalt containing HIC with color-change from blue to pink
2) Cobalt free type of HIC with color-change from brown to azure
3) Cobalt-Dichloride Free HIC with color-change from blue to pink
