IEM Tel-O-Graph GSM Mode D'emploi page 64

Memory
2) Wait until [c lr] flashes on the display (Fig. 10/B).
3) Press the
 You hear an acoustic signal and the display
shows [c lr] permanently.
4) Press and hold the
than 5 s.
 The acoustic signal sounds 3 times and the
display shows [M00] (Fig. 10/C).
The measurements are deleted.
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– button.
– button for more