BOD Incubators hold water samples at 20 degrees C for the five-day biochemical oxygen demand test, where the drop in dissolved oxygen shows how much organic load bacteria consume. Refrigerated and heated control covers 5 to 60 degrees C, so the same cabinet also runs 37 degree C cultures and low-temperature stability trials. Chamber sizes run from 80 L benchtop units to 1000 L floor models, with fluctuation and uniformity within 0.3 degrees C at 37 degrees C, timers from 1 minute to 99 hours and two to five adjustable shelves. Typical uses include BOD testing of wastewater, river water and industrial effluent, water quality monitoring, microbial culture and pharmaceutical stability studies.