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HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy
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Amazon.com: HM Digital TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy : Industrial & Scientific
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Lab Junction TDS Meter Table Top,Digital TDS Meter in 5 Ranges LJ-651 as per Quality Standards – Lab Junction
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