In many industrial sectors, moisture effect or humidity effects requires to be kept in a specific level in order to maintain the quality of the products. Though there is no denying the importance of water in our life, but it may not be very helpful for some specific industrial products like medicines, electronic goods, chemical products etc. In such cases humidity level plays a very important role. In order to come out with the exact quality products, this level should be specific. And if the humidity level is higher than the required level, moisture desiccants need to be applied accordingly. But before that humidity level should be determined. And for that reason humidity indicating cards are applied.