General Tools and Instruments LDM60 - Manual (Page 17)

Adding and Subtracting Distances
The LDM60 has two front-panel buttons that make it easy to
add or subtract a distance measurement from an existing
measurement, in effect turning the earlier measurement into a
baseline. This addition/subtraction function comes in handy
when accumulating multiple distance measurements.
For example, consider how the meter could speed up the
measurements involved in laying out a long brick wall of multiple
sections that are not in a straight line. Once stakes, strings and
frame are in place, the LDM60 could accurately measure the
length of each section by shooting from one stake to the next.
The meter would also keep a running total of these
measurements and display the final result—the wall’s
perimeter—on its bottom line.
To add a measurement to an existing measurement displayed
on the bottom line, press the
button. The earlier
measurement will be moved from the bottom line to the second
line and a flashing
icon will appear at the left of five dashes
(representing the distance value to be added) on the third line.
Then press the
button while aiming the laser at the point
from which the first measurement was made. The meter will
measure the distance to that point, replace the dashes on the
third line with that value, and display the sum of the two
measurements on the bottom line (Fig. 7).
MEAS
17