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Amazon.com: Bluelab TRUNV2 Truncheon Nutrient Meter, Digital Conductivity Tester in Water (Scales Include: EC, 500, ppm 700, CF, TDS) Tool for Hydroponic System and Indoor Plant Grow, White : Industrial & Scientific
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Amazon.com : Bluelab Truncheon Nutrient Meter for Plant Germination & pH Pen - The Ultimate Handy Solution for Measuring pH and Temperature - PENPH : Patio, Lawn & Garden
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LYUMO Nutrient Meter Test Nutra Wand Truncheon Hydroponic EC/PPM/CF Hydroponics Readers - Walmart.com
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