DOS-1707 ppm level portable Desktop Dissolved Oxygen Meter is one of the electrochemical analyzers used in laboratory and a high-intelligence continuous monitor produced by our company. It can be equipped with the DOS-808F Polarographic Electrode, achieving a wide range ppm level automatic measurement. It is a special instrument used for testing the oxygen content of the solutions in the boiler feed water, condensate water, environmental protection sewage and other industries.