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Ion Tester - High Precision pH Measurement- Wide Range Testing (0.000-9999mg/L) - LCD Display, USB Connectivity, GS Certified - Perfect for Water Quality Analysis, Labs, and Industry Use: Amazon.com: Industrial & Scientific
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Handheld Ion Meter PH Meter with Range 0.001 to 19999 ppm mg/L MOL/L -2.000 to 20.000 pH: Amazon.com: Industrial & Scientific
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