Sheldon Signature Extra Shelf for 1555 General-Purpose Incubators. Combining top-notch and uncompromising quality with an affordable price the Sheldon Signature General-Purpose Incubators 5130524/ 35823-509 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: Exclusive Hybrid Heating System Microprocessor Control Easy Keypad Set and Calibration Over-Temperature Protection Access Port Heated Outer Door Interior Electrical Outlet Stainless Steel Interior and Shelves VWR Two-Year Limited Parts and Labor Warrant Heating elements in all three walls bottom and door create a warm air jacket around the inner chamber to guarantee superior temperature uniformity with no hot spots. Warm air jacket design also provides quick temperature recovery-and there s a full-length inner glass door for viewing specimens without disturbing the chamber atmosphere. No need to worry about heater element damage from spills either-the inner chamber is tack-welded and the low-watt density heating elements are safely isolated from the work chamber. Microprocessor controlled for easy keypad set and calibration. Temperature display may be calibrated to match a secondary thermometer. For over-temperature protection a second independent safety controller can be preset and has visual alarm when activated. All units are stackable without the need for spacer racks. Features through-wall access port for chart recorder. A UL-approved vapor-tight electrical outlet is inside the sealed chamber. Adjustable leveling feet compensate for uneven surfaces. Shelves adjustable in 1.3cm (1/2") increments. All models are UL and C-UL listed. CE marked. 115V models are also CSA certified. Specifications for Sheldon Signature Extra Shelf for 1555 General-Purpose Incubators 5130524 : Unit: Each Temperature Range: 5 above ambient to 60 C Uniformity: 0.25 at 37 C Sheldon Signature Extra Shelf for 1555 General-Purpose Incubators 5130524