Item Brochure

1810 S E F i r st S t r e e t , S u i te H
Redmond, OR 97756
www.LaserLineMfg.com
Phone [phone]
Fa x 541 548 0892
HOW TO READ TRUE ELEVATION IN FEET, INCHES AND FRACTIONS OF AN INCH
YELLOW BACKGROUND – BLACK NUMBERS
1 Set rod foot on a benchmark or hub with a known elevation; i.e. 2,525 feet 4
1
/4 inches elevation.
2. Run the laser receiver up or down the side of the rod and / or raise or lower front rod section until
you get the “on grade” signal on your laser detector. If you are using an optical instrument, site to
the rod and use the horizontal line as your grade reference.
3. Loosen the tape lock pin (lower knob) and disengage the tape pin from the grommet.
4. Roll the tape face until 5 feet 4
1
/4 inches is across from the pointer on the laser detector bracket,
or the horizontal line on your optical instrument. You are using the last whole number of 2,525
(which is 5 feet) plus the inches and fraction of an inch (which is 4
1
/4 inches).
5. Lock the tape by engaging the tape lock pin into the nearest grommet. Then tighten the knob.
You have now locked into the rod elevation (2,525 feet 4
1
/4 inches). All future readings will be
true elevation above or below 2,525 feet 4
1
/4 inches (5 feet 4
1
/4 inches) as read on the rod.
6. To find an elevation, simply set the rod foot at any location on the job within the range of your laser
or optical instrument. Run the detector and / or front rod section up or down until you pick up the
“on grade” signal from your detector. Read the number opposite the pointer. That number is your
true elevation. If using an optical instrument, just read the number across the horizontal line. That
number is your true elevation.
EXAMPLE:
Rod reading is 6 feet 5
3
/4 inches = 2,526 feet 5
3
/4 inches true elevation
Rod reading is 4 feet 7
1
/2 inches = 2,524 feet 7
1
/2 inches true elevation