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JJG 291-2008 English PDF (JJG291-2008)

JJG 291-2008 English PDF (JJG291-2008)

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JJG 291-2008: Verification regulation of dissolved oxygen meter with covered-membrane-electrode
This regulation applies to initial verification, subsequent verification and in-use verification of laboratory-service and portable dissolved oxygen meters with covered-membrane-electrode that have a measuring range of (0 ~ 20)mg/L.

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