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Digital TDS Meter+PH Tester Paper Aquarium Pool Hydroponic Water Test Pen Stick

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8 - 11 indicates alkalinity. 12 - 14 indicates a very high level of alkalinity. You can also check for hardness (1 grain = 17ppm). PH ATC Tester Accuracy: ±in 0.1 pH (at 20?). Typical EMC DEV: ± 0.2 P...
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