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Old 01/26/2017, 06:31 AM   #1
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Join Date: Sep 2007
Location: nj
Posts: 520
calibrating HM Digital DM-2 Deluxe In-Line Dual-Probe TDS Meter


i have two of these units ( i purchased awhile ago to replace the ones on my uhe unit, i broke one of the dm-1 ones, figure i would upgrade to these, fastward a year later. i finally was able to get them installed. my problem is the calibration is off alittle. my other tds meter would read 150,0,0,0. always even with my maxicap system. with the new ones,i am getting 155,1,1,1 . not a big deal, how do you calibrate these or is there an adjustment on them.



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Old 01/26/2017, 09:58 AM   #2
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Join Date: Jun 2003
Posts: 4,627
Hi Roy,

I recommend following the manual for calibration to assure that it's reading correctly. I have provided the links below for the manual and also the calibration solution as well. Let us know if you have any other questions.

Brian in Support at SpectraPure

Innovators in water technology.
Since 1985!
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