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GroStar® GS3 EC/ppm Pen Tester (Gen II)
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Bluelab Conductivity Pen – OCG
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HM Digital COM-80 Pen Style TDS/EC/Temp Meter – Direct Garden Supply
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Bluelab Conductivity Pen | Bluelab New Zealand
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M0199720 6-in-1 Water Tester Combo Pen pH, ORP, EC, TDS, Salinity, & T – Gain Express
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