This standard is formulated for the purposes of enforcing the Environment Protection Law of the People’s Republic of China and Water Pollution Prevention and Control Law of the People’s Republic of China, protecting the environment, safeguarding the human health, and specifying the technical requirement and test procedures for portable dissolved oxygen meters. This standard specifies the technical requirements, performance indicators, and testing methods of the portable dissolved oxygen meters.

 Technical requirement and test procedures for portable dissolved oxygen meter (HJ 925-2017)