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Apera Instruments SX716 Portable Lab Dissolved Oxygen DO Meter, Waterproof, Automatic Temperature, Salinity Compensation and Calibration Silver AI461: Amazon.com: Industrial & Scientific
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RCYAGO Dissolved Oxygen Meter with DO Probe, DO Meter Water Quality Monitor Freshwater Aquarium Test Kit, Digital Dissolved Meter Portable Pen Type Meter, 0.0-20.0mg/L ±0.3mg/L: Amazon.com: Industrial & Scientific
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