... IPC/JEDEC J-STD-033 within the electronics industry. Suitable for storing: Semiconductors, IC packages, PCBs, Silicon Wafers, Ceramics , ... (Exchange free desiccant), very economical. No use of batteries for hygrometer. Long lasting and highly reliable. With detachable shelves, ... is available to use. With high technology( photocatalyst, IC timer, shape-memory alloy and dual digital hygrometer)