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HM Digital COM-80 Pen Style TDS/EC/Temp Meter – Direct Garden Supply
Bluelab Conductivity Pen (EC or ppm) – Black Dog LED Europe
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TK303PLUS Water Quality Meter, IP67 PH Salinity TDS EC Conductivity Te – Tekcoplus Ltd.
4 in1 Water Quality Tester Pen Type Multifunctional PH/EC/TDS/Temp Water Meter Portable Digital Water Conductivity Temperature Monitor: Amazon.com: Industrial & Scientific
%20(1)-png.png "Getting started: The Bluelab Conductivity Pen")