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Amazon.com: TDS Meter Digital Water Tester - ppm Meter, EC & Temperature Test Pen 3-in-1 | Easy to Use Water Quality Tester | Ideal for Testing RO Drinking Water Hydroponics Aquarium Swimming
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Amazon.com: PH and TDS Meter Combo, Digital Water Tester 0.05ph High Accuracy Pen Type pH Meter ± 3-in-1 TDS EC Temperature & Conductivity Meter PPM Meter for Home Drinking Water Hydroponics Aquarium
