Waterproof Dissolved Oxygen Meter Pen DUCTWORK It's a great way to

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Waterproof Dissolved Oxygen Meter Pen DUCTWORK It's a great way toMeasures dissolved oxygen to determine water quality in environmental testing, labs, industrial and municipal wastewater, aquariums and fish hatcheries. Designed for simple one hand operation with automatic temperature compensation and calibration to air. The polarographic probe has a built in temperature sensor and easy to replace pop off probe heads. Simultaneously displays dissolved oxygen and temperature readings. Also holds readings and recalls