1,179
people found this helpful, as of 2023
ranked #7,759 most helpful
out of 571,544,897 reviews
★★☆☆☆
This item is not calibrated correctly
I bought two of TDS-EZ Water Quality Testers and while both are placed in the same glass of water, the one reads 752 ppm and the other 371 ppm. You can only conclude that they have not been calibrated in the factory, as claimed on the packaging.
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the product in question
HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy,Purple
4.4★ · 7,232 ratings, as of 2023