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My EC meter displays it out to 4 numbers as well or yours (303 x10) just leaves the extra one off. Also, it is probably displaying in MICRO siemens while it is mostly shown on this site in milli siemens I just convert mine to milli in my head when I write it down. Like your EC reading would be .3030 milli Siemens ........convert e-6 to e-3 by dividing by 1000
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