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There are no decimal points with most handheld TDS meters, what looks like a dot is a power ON indicator so the readings are really 5, 1, 175 etc. One exception to that is the HM Digital COM-100 which reads to one decimal point so like 175.3. My tap water is 585, my RO only runs between 2 and 3 and both DI cartridges read 0.


