Humidity indicator card is a quick, a low cost method. It is printed with moisture sensitive spots which respond to various levels of humidity with a visible color change from blue to pink, it help provide visual proof of the relative humidity level within a given environment. It is easy to monitor the interior humidity conditions of the package, and easy to see if your desiccant is working well or need to be replaced inside a sealed package or closed space. Available in numerous configurations, cards are constantly indicate relative humidity as low as 10% and as high as 60%, depending on the application and need. All the HICs meet MIL-I-8835.