4.5.6. Backlight display time setting (P5)
(a) Short press key in mode P4 to enter mode P5, see picture
(4-6).
(b) Press or key to choose the auto-off time of backlight:
0 min, 1 min, 3 min or 6 min. The back light display function will
be closed if choosing 0 min.
(c) Press key to enter next parameter setting or press key to confirm and
return to measuring mode.
(d) The default setting for P5 is 1 min.
4.5.7. Auto power-off time setting (P6)
(a) Short press key in mode P5 to enter mode P6, see picture
(4-7).
(b) Press or key to choose the time: 0min, 10min or
20min. The auto power off function will be closed if choosing
0min.
(c) Press key to enter next parameter setting or press key to confirm and
return to measuring mode.
(d) The default setting for P6 is 0 min (see item4.4.2).
4.5.8. Restore to factory default setting (P7)
(a) Short press key in mode P6 to enter mode P7, see picture
(4-8).
(b) Press or key to choose “On”, meaning that
parameters have been restored to the factory default setting
mode, and the meter returns to measuring mode after 2 seconds.
4.6 Replace the Membrane Cap
When electrode’s response time becomes longer, error appeared in displaying value,
or when the sensitive membrane of DO electrode is wrinkled, cracked or damaged,
users should replace a membrane cap according to the following steps.
(a) Screw off the membrane cap;
(b) Wash the electrode without membrane cap with distilled water and dry it.
(c) Clean on the cathode surface (gold slice) with a piece of clean tissue;
(d) Inject electrolyte into a new membrane cap slowly and do not let any air bubbles
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