RH Control Range : 35% ~ 55% RH Controllable External Dimensions (cm) : Ext: W60 x H193 x D66 Internal Dimensions (cm) : Ext: W55 x H172 x D61 One shelf can fit approximately 4 units of Olympus CH20 Microscopes. Capacity : 657Litres Door : Metal Frame with Glass Door Cabinets : High Quality Steel Airtight Cabinet, Anti-rust Coating Shelves : 2 pcs Steel Shelves. Heavy Loading up to 200kgs Power consumption : Ave. 24W Hygrometer : Japan-made Calibrated Analog thermo-hygrometer