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Dissolved Oxygen Meter Kit Air Filter These vibrant colours can makeReliable DO readings at a reasonable price Measures dissolved oxygen to determine water quality in environmental testing, labs, industrial and municipal waste water, aquariums and fish hatcheries. The back lit display simultaneously displays dissolved oxygen (in % or mg L) and temperature readings (in C or F). Automatic temperature compensation as well as manual compensation for salinity and altitude. Features simple one button calibration to air. DO