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#4
10-24-2009, 04:15 AM
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I would calibrate both of them using 342 ppm NaCl califbration fluid, and then re-check. I know mine is difficult to calibrate (it's a $30 handheld)...so I wonder on its accuracy.
Last edited by Myka; 10-24-2009 at 04:17 AM. 
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