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Bluelab PENPH pH Pen, Digital Meter for Water with Easy Two Point Calibration and Double Junction Probe, Test Kit for Hydroponic System and Indoor Plant Grow, White : Amazon.ca: Industrial & Scientific
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Amazon.com: Bluelab PENSOILPH Soil pH Pen, Digital Meter and Water Test Kit, Also Used for Coco and Rockwool with Easy Calibration for Hydroponic System and Indoor Plant Grow, Clear : Patio, Lawn
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