Hanna Instruments PCA 300 Series - Manual (Page 39)

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DIAG
3.D.2 Enter code 103 using the and keys.
3.D.3 Press DIAG; “r dn” will be displayed and the analyzer
will execute this mode fine tuning upper value.
3.D.4 The reading on multimeter will slowly
decrease. When the desired value is
reached, press DIAG again to store it
and quit the mode.
DIAG