What info do you want? Google for owner's manual for the DM2 to compare. Have you tried calibrating yours yet? Put both probes into the same glass of tap water and see if they read the same. If they do you're lucky (for now), if they don't read the same then there is nothing you can do to get them to read the same. Then you need to set the lower reading one to the calibration solution (usually 342 ppm), and if the second one then reads 3 ppm higher you just have to remember that 3 ppm on the second one means "0". That's about all you can do.
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~ Mindy
SPS fanatic.
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