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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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APERA INSTRUMENTS AI209-T Value Series PH20 pH Tester Combo Kit, Including The Maintenance Set & AI1113 pH Calibration Buffer Solution Kit (7.00, 4.00), 8 oz. Each: Amazon.com: Industrial & Scientific
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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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Apera Instruments AI1114 pH Calibration Solution Kit (7.00, 4.00), 16 oz. for Each, Plus Apera CalPod Solution Holder, NIST traceable: Amazon.com: Industrial & Scientific
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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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APERA INSTRUMENTS AI1116 pH Calibration Solution Kit (7.00, 4.00, 10.01), 16 oz. Each, Plus a CalPod Solution Holder for Easy Calibration, NIST traceable: Amazon.com: Industrial & Scientific
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