In 2022, the LL-M3 BOD-Q water quality analyzer was successfully delivered to the Hydrological and Water Resources Survey Bureau in the upper reaches of the Yangtze River. Engineers completed instrument training on site. The LL-M3 BOD-Q water quality analyzer can simultaneously detect 64 samples, meeting the needs of rapid and synchronous measurement of large amounts of data in scientific research, water quality testing, teaching experiments, and other fields.