Totech Auto Dry CSD-502-20 is engineered for long-term storage of 20%~50%RH. The circulation of air in the cabinet is regulated by an internal fan. Hygrometer is battery operated. Specifications: 1. Humidity Range: 20%~50%RH adjustable by digital panel) 2. Sensor accuracy: ±5%RH 3 .External dimensions:  (W x H x D) 880 x 900 x 740 mm 4. Internal dimensions:  (W x H x D) 610 x 1560 x 730 mm 5. Weight: 60 kg 6 .Capacity: 510 L 7 .Shelves (W x D): 3 pcs, adjustable 8 .Max weight on shelf:50 kg 9 .Structure: 1.2mm Steel, 10 .Cabinet color: Gray 11. Door:2 pcs, with handles, airtight magnetic sealers and glass. 12. Voltage: 220 V AC (110 V AC optional) 13. Power consumption: Ave. 30.5W/h； 14. Castors: 4pcs, 2 of them with brakes  15 Performance of CSD-502-20