Operating Instructions

In a word, to select the reference level, push button repeatedly until the
required reference level is indicated in the display. Each time after switching
on, the rear edge of the measuring tool is preset as the reference level.
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Press this button to take the selection from the front edge A special
beep sounds whenever the reference setting is changed. After a re-startup
the reference returns automatically to the default setting (rear reference).
Press this button again to take the next selection from end piece edge.
Press this button, to set the rear reference again.
Display illumination