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0-14 pH Electrode Probe BNC Connector, 300cm Cable for PH Meter Monitor Controller Test Sensor, Replacement Kit for Aquarium Hydroponics Plant Pool Spa (pH Electrode): Amazon.com: Industrial & Scientific
Amazon.com: Extech 601100 Flat Surface Electrode 15 by 106mm : Industrial & Scientific
RCYAGO pH Meter with Ph Electrode and Batteries, pH Tester for Water Milk Cheese Soil Food: Amazon.com: Industrial & Scientific
