... OEM allowed 2,reversible color change 3,quick delivery within 24 hours six dots humidity indicator label 1, Brief:humidity indicator card ... -free ROHs compliant2,reversible color change,3,quick delivery within 24 hours4, OEM allowed5, cocl2, coblat free and cocl2 free ... , size and RH can be made by customers' needs4, ApplicationPrinted Circuit Board, PCB, LED, SMD LED, IC,electronic packaging , optical ...