No cobalt humidity display adapters (excluding 2 cobalt chloride), according to eu environmental regulations 67/548 / CEE has two cobalt chloride as the second carcinogenic substance and banned all export goods must comply with the laws and regulations. This company does not contain cobalt environmental humidity indicator CARDS in European exports standard, this product is traditional humidity indicator CARDS, the upgraded products adopt advanced technology, in addition to the traditional humidity indicator CARDS of cobalt. The humidity card, do not contain carcinogenic substance of environmental protection, Easy to use, easy to observe the characteristic of the large scope, instructions, and reusable, via a calibrated sensitive instructions to higher sensitivity.