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Oakton pHTestr 30 Waterproof pH Tester with Temperature Display | Instrumentation2000
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Amazon.com: VIVOSUN 3-in-1 Digital pH Meter with ATC, Soil Tester for Moisture, pH and Light-Indoor and Outdoor Use : Industrial & Scientific
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Ph Meter 0.01 High Precision For Water Quality Tester With 0-14 Measurement | Fruugo NO
