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Apera GroStar GS4 5 in 1 pH & EC Combo Pen Tester Gen II pH, EC, ppm, Temp, TruRead field meter 0 ppm (mg L) fluoride detection double junction pH probe 0 ppm (mg L) fluoride detection in industrial and treatment applications ✅ Lab grade SE220 double junction gel filled electrode — low maintenance long life EC ppm measurement the GS4 simultaneously measures pH
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