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Amazon.com: C-100 5 in 1 Salinity TDS EC Seawater Tester Multifunction Water Quality Detector Test Pen with Backlight : Patio, Lawn & Garden
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Hydro Master TDS Meter Digital Water Tester, 3 in 1 TDS, EC and Temperature Meter with ATC, Perfect for Drinking Water, Aquariums etc : Amazon.ae: Industrial & Scientific
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