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Bluelab Conductivity Pen - Conductivity (PPM) Pen Meter
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Bluelab pH Pen
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Amazon.com : Bluelab PENCON Conductivity Pen and Digital TDS Meter, Water Tester for Temperature and Nutrient (CF, EC, PPM 500, PPM 700), TDS Testing Kit for Hydroponic System and Indoor Plant Grow :
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BlueLab Bluelab Grower's Toolbox (EC pen, pH pen and Carekit) - The online shop for Gardening
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