Bluelab TRUNV2 Truncheon Nutrient Meter, Digital Conductude: EC, 500, ppm 700, CF, TDS) Tool for Hydroponic System and Indoor Plant Grow, White. . APERA INSTRUMENTS AI316 Premium Series PC60 5-in-1 Waterproof pH/EC (Conductivity) /TDS (ppm) /Salinity (ppt) /Temp. Multi-Parameter Pocket Tester Kit.
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