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[Amazon.com] Digital Pocket PH Water Meter Tester For Aquarium Pool Spa Wine Hydroponics Test

[Amazon.com] HM Digital pH/Temperature Meter

[Amazon.com] HM Digital TDS-4 Pocket Size TDS Tester Meter Without Digital Thermometer, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracy

[Amazon.com] HM Digital TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

[Amazon.com] CyberTech PHTester PH-107 Digital pH Meter Tester, With 2 Pack of Calibration Solution Mixture Included.

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