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Battery Safety
WARNING: Batteries can explode, or leak, and can
cause injury or fire. To reduce this risk:
•
Carefully follow all instructions and warnings on the
battery label and package.
•
Always insert batteries correctly with regard to
polarity (+ and –), as marked on the battery and
the equipment.
•
Do not short battery terminals.
•
Do not charge disposable batteries.
•
Do not mix old and new batteries. Replace all batteries
at the same time with new batteries of the same
brand and type.
•
Remove dead batteries immediately and dispose of
per local codes.
•
Do not dispose of batteries in fire.
•
Keep batteries out of reach of children.
•
Remove batteries when the device is not in use.
Installing AA Batteries
Load new AA batteries in the STHT77498-1 or
STHT77499-1 laser.
1. Turn the laser upside down.
2. On the bottom of the laser, lift up the latch to open the
battery compartment cover (Figure B1).
3. Insert four new, high-quality, name brand AA batteries,
making sure to position the - and + ends of each battery as
noted inside the battery compartment (Figure B2).
4. Push the battery compartment cover closed until it snaps in
place (Figure B3).
When the laser is not in use, keep the Power/ Transport
Lock switch in the center (OFF) position (Figure A2) to save
battery power.
Turning the Laser On
1. Place the laser on a smooth, flat, level surface, with the
laser facing straight ahead toward the opposing wall
(0º position).
2. Turn the laser ON to display a horizontal laser beam. Either:
a. Move the Power/Transport Lock switch to the left to
keep the pendulum locked and display the beams in
manual mode (Figure A1).
b. Move the Power/Transport Lock switch to the right
to unlock the pendulum and display the beams in
self‑leveling mode (Figure A3).
3. Press (Figure A4) once to display a horizontal laser beam, a
second time to display a vertical beam, and a third time to
display both the horizontal and vertical beams.
4. Check the laser beams.
a. If the laser is tilted so much that it cannot self-level
(> 4°), or the laser is not level in manual mode, the laser
beams will flash.
b. If the laser beams flash, the laser is not level (or
plumb) and should NOT BE USED for determining or
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marking level or plumb. Try repositioning the laser on a
level surface.
5. If ANY of the following statements are TRUE, continue with
the instructions for Checking Laser Accuracy BEFORE
USING THE LASER for a project.
a. This is the first time you are using the laser (in case
the laser was exposed to extreme temperatures).
b. The laser has not been checked for accuracy in
a while.
c. The laser may have been dropped.
Checking Laser Accuracy
The laser tools are sealed and calibrated at the factory. It is
recommended that you perform an accuracy check prior
to using the laser for the first time (in case the laser was
exposed to extreme temperatures) and then regularly to
ensure the accuracy of your work. When performing any of
the accuracy checks listed in this manual, follow these
guidelines:
Use the largest area/distance possible, closest to the
•
operating distance. The greater the area/ distance, the
easier to measure the accuracy of the laser.
•
Place the laser on a smooth, flat, stable surface that is
level in both directions.
Mark the center of the laser beam.
•
Horizontal Beam - Scan Direction
Checking the horizontal scan calibration of the laser requires
two walls at least 30' (9 m) apart. It is important to conduct a
calibration check using a distance no shorter than the distance
of the applications for which the tool will be used.
1. Place back of the laser against a wall and facing straight
ahead toward the oppsing wall (Figure D1).
2. Move the Power/Transport Lock switch to the right
(Figure A3) to turn the laser ON in self- leveling mode and
display a horizontal and vertical beams.
3. Turn the laser 45º counter-clockwise so that the right-most
end of the laser line is displayed on the wall.
4. Mark a on the center of the beam on the wall.
5. Turn the laser 90º clockwise so that the left-most end of the
laser line is displayed near a (Figure D2).
6. Mark d on the center of the beam on the wall.
7. Measure the vertical distance between a and b .
8. If your measurement is greater than the Allowable Distance
Between a and b for the corresponding Distance Between
Walls in the following table, the laser must be serviced at an
authorized service center.
Distance Between
Allowable Distance Between
Walls
30' (9 m)
40' (12 m)
50' (15 m)
a and b
15/32" (12 mm)
9/16" (14.4 mm)
23/32" (18 mm)
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