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Old 11/29/2005, 10:54 AM
Billybeau1 Billybeau1 is offline
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Join Date: Jul 2005
Location: Dyer, Indiana
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I'm not an expert on this by no means but the HM tds meter uses NaCl solution at 342 ppm. The hanna solution in the picture says 800 ppm. To my knowledge the HM units do not need very frequent calibration if your using them for RO/DI only.