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I just purchased a HANNA Primo TDS meter. It seems like a nice unit
although I can't compare it to anything as this is the first TDS meter I
have ever owned. It measures in ppm. One thing the instructions did not
mention was how often you should use the calibration solution in
calibrating the unit. Is this something that should be done prior to
every test you do or is it something you do occasionally?
Any shared info is greatly appreciated.
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