The ACM-890 microcomputerized BOD5 analyzer is designed to measure biochemical oxygen demand over five days by assessing pressure changes in sealed culture bottles due to biochemical oxidation. The device has a measuring range of 0 to 1000 mg/l, can process 8 samples simultaneously, and operates at a culture temperature of 20°C. It is widely utilized in academic, petrochemical, and environmental sectors for water quality monitoring.