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Bluelab CONTPHCON pH Controller Connect with Monitoring, Dosing, and Data Logging in Water (Stick not Included) Digital Meter for Hydroponic System and Indoor Plant Grow, White: Amazon.com: Industrial & Scientific
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Gowe Digital LCD Display pH CO2 Controller Meter Aquarium Fish Tank 0.00~14.00PH Range + Switched Socket 220V-230V or 100-110V - Amazon.com