The Model SRI20P B.O.D. Thermoelectric Cooled Incubator, 19.3 Cu.Ft. (300 Bottle) Capacity is designed primarily for use in wastewater and sewage testing, but have applications for general lab research as well. Using innovative thermoelectric cooling technology, the LI20P eliminates the need for a refrigeration compressor. This means that these units use 78% less power than alternative models and reduce room air conditioning loads by 75%. They also include 75-pound capacity shelves, which eliminates sagging. These incubators meet APHA specifications for Biochemical Oxygen Demand (BOD) and include a mechanical convection system to ensure even air distribution, digital temperature set controller, over temperature limit control, and a digital temperature display. A one amp interior outlet allows use of shakers, stirrers, roller bottles or other apparatus. Units are supplied with adjustable leveling feet. The SRI20P low temperature incubator is ideal for testing of sewage and wastewater, as well as other low and room temperature applications. Microprocessor Control System P.I.D. Temperature Control LED Display of Set Point and Chamber Temperature Interior Electrical Outlet Fan Assisted/Forced-Air Circulation Aluminum Interior 24 Month Limited Warranty