Hach POCKET TURBIDIMETER User Manual page 48

Analysis system
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valid
* If a
previous calibration exists, that calibration may be recalled to replace a new
calibration which is incorrect. If E04 through E09 is flashing on the display when the cal-
ibration routine is complete, press the
key within approximately one minute.
READ
OLd will appear on the display to denote retention of the previous calibration.
If OLd does not appear and the error code recurs, the previous calibration is invalid or
does not exist. Recalibrate the instrument.
36

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