Leica Geosystems Leica DISTO Classic3 - Manual (Page 33)

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You will obtain the best results if
the DISTO is rotated around a
fixed point (rear edge, thread
position) and the axis of the laser
beam passes through this axis. So
do not simply place on a camera
tripod, in this case the axis of the
laser beam is approx. 70 to 100mm
above the centre of rotation, this
can lead to significant variations in
the height.
Function Key
For short distances, a good base
behind the instrument is sufficient
for mechanical alignment.
After "2 ---", align the DISTO
approximately horizontally.
Or:
Aim at third point.
Trigger measurement.
End function, the height and
distance are displayed from three
measurements (Pythagoras).