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Use a handheld TDS meter to confirm the inline readings. The handhelds are more accurate and give you the added portability where the inline is dedicated and depends on flow past the probe to work. The reason inlines are not as accurate is they monitor air temperature and not water temperature. The readings can be something like 2% off for every degree difference C. in the air and water temperatures. I have two dual inlines and rarely use them for that reason, they never agree with good handheld like the HM Digital COM-100.
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