Display / keypad illumination
The instrument has a sensor that automatically switches the display and keypad illumination on or off in response to lighting conditions.
Reference setting
The default reference setting is from the rear of the instrument.
Press this button to take the next measurement from the front edge 
. A special beep sounds when- ever the reference setting is changed.
After a measurement the reference returns automat- ically to the default setting (rear reference). See figure {H}.
Press this button for longer the front reference is set permanently.
Press this button, the rear reference is set again.
Measuring
Single distance measurement
Press to activate the laser. Press again to trigger the distance measurement.
The result is displayed immediately.
Minimum/maximum measurement
This function allows the user to measure the minimum or maximum distance from a fixed measuring point. It can also be used as to determine spacings. See figure {I}
It is commonly used to measure room diagonals (maximum values) or horizontal distances (minimum values).
Press and hold down this button until you hear a beep. Then slowly sweep the laser back and forth and up and down over the desired target point - (e.g. into the corner of a room).
Press to stop continuous measurement. The values for maximum and minimum distances are shown in the display as well as the last measured value in the summary line.
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Leica DISTO™ D3 760498a en
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Measuring