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TDS-3 (Hand Held Meter)
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Portable TDS-3 Meter Digital TDS Water Quality Testing Pen Aquarium Pool Tester Hardness Meter GH/DH Test Tool Accessories _ - AliExpress Mobile
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Total Dissolved Solids TDS Water Quality Purity Meter 0-9990PPM – Envistia Mall
TDS-3 Handheld TDS Meter - Bulk Reef Supply
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HM Digital TDS-3 Handheld TDS Meter with Carrying Case with 0 – 9990 ppm (mg/L) Range and +/- 2% Accuracy