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Amazon.com: High Accuracy pH Electrode with Calibration Powder, 0-14 pH Probe with BNC Connector & 300cm Cable for Wide Application : Patio, Lawn & Garden
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0-14 PH Analytical Surver Electrode PH Probe BNC Plug Connector for Aquarium PH Meter Controller Gib Digital PH Sensor Electrode: Amazon.com: Industrial & Scientific
