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Getting started: The Bluelab Conductivity Pen
BlueLab Grower's Toolbox pH & EC meter kit - pH and EC testers
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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 :
