General LM30 Instruction Manual page 6

Double Pythagorean measurement
The double pythagorean mode calculates indirect measurements
when the length is higher and lower than the measurement
position. To achieve accurate results the distances must be at a
right angle.
‣ Press the menu button seven times to enter double pythagorean
measurement mode. A double triangle will appear on the display
screen with one edge flashing.
‣ Press the power on / read button to take the first measurement
from point A (A-B).
‣ Press the power on / read button to take the second
measurement (A-D). This measurement must be taken from
the same point as A-B.
‣ Press the power on / read button to take the third measurement
(A-C). This measurement must be taken from the same point as
A-B and A-D.
‣ The distance will be calculated automatically (B-C) with results
shown on the display screen.
‣ Press the clear / back / power off button to clear data. Press
and hold the clear / back / power off button to exit single
pythagorean mode.
B
D
C
Adding measurements
‣ Press the menu button two times to enter addition mode.
A plus icon will appear on the display screen.
‣ Press the power on / read button to take the first measurement.
‣ Press the power on / read button to take the second
measurement. The values will be added automatically with
results shown on the display screen.
‣ Press the clear / back / power off button to exit addition mode.
Subtracting measurements
‣ Press the menu button three times to enter subtraction mode.
A minus icon will appear on the display screen.
‣ Press the power on / read button to take the first measurement.
‣ Press the power on / read button to take the second
measurement. The values will be subtracted automatically with
results shown on the display screen.
‣ Press the clear / back / power off button to exit subtraction mode.
A