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User‘s manual for CP-511 pH meter v1.10
14. Readout of the software version number
In order to check the software version number turn the meter off and next,
holding the button, turn the meter on by pressing the
button. Instead
of the display test, the screen as in the picture below will appear (Pic. 12). In
the upper row the software version will appear.
Pic. 12
After about 1.5 s. the meter enters the measurement mode.