Model Number: HI-0001 Key Specifications/Special Features: Humidity indicator card is a kind of accurate and convenient humidity testing means, through the color change of the indicting dots on the card.Easy to clearly observe the relative humidity inside the current packaging, it is not only simple in operation, but also low in cost, making it an important auxiliary tool for moisture proof packaging.After years of study and practical application, TopPack has developed several dozen varieties of humidity indicators card in four major categories of cobalt series humidity indicator, Cobalt Main Export Markets: Asia