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Replacement pH Electrode Long Cable 0-14pH Probe Test Water Liquid Ocean Sea Water Acid Rain with Glass Bulb (200cm ph Electrode): Amazon.com: Industrial & Scientific
Gain Express Soil Ph & Moisture Meter 295mm Long Electrode
Amazon.com: Soil pH and Moisture Meter 2-in-1 Tester 308mm Long Waterproof Metal Electrode for Indoor & Outdoor Gardens Plants Flowers Farming : Patio, Lawn & Garden
Amazon.com: Extech 60120B Mini pH Electrode (10 by 120 mm) : Industrial & Scientific
Replacement pH Electrode with Calibration Powder, 0-14 pH Highly Accurate Probe with BNC Connector & 200cm Cable for Continuous Liquid Measurement: Amazon.com: Industrial & Scientific
