Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic conditions at a specified temperature. BOD is used to gauge the short-term impact wastewater effluents will have on the oxygen levels of receiving water, BOD TESTER /Biochemical Oxygen Demand analyzer-Measurement range: 0⁓1000 mg/L (diluted when value exceeds the measurement range) Simultaneous determination..