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Old 02-19-2008, 01:42 AM
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I used the "ultra-pure" water that came with the refractometer to calibrate it.

I just tested the 53 mS fluid on the refractometer and it tested 38 pts!

Oh man... I had a marine tank for a year in the past and always went by the refractometer thinking it was absolute. Having it off by 3 pts is a big deal. It troubles me that these companies and fish stores don't tell you this.
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