TOOLCRAFT LDM 80T Mode D'emploi page 61

Keep a right angle when measuring the second distance.
3. The height is calculated automatically and is shown in the bottom
line.
With three reference points
1. Press the indirect measurement button (G) twice. The indicator for
indirect measurement with three reference points appears left in the
display.
2. Now measure the three necessary lengths. For the correct order,
see the following illustration or follow the blinking segments of the
indicator for indirect measurement with three reference points.
1
3
2
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