Stanley STHT77502-1, Original Instructions Manual, Page: 11 / 24

9
English
Side Vertical Beam Accuracy
Checking the vertical (plumb) calibration of the side laser can be
most accurately done when there is at least 16 ft. (1.5 m) of floor
space and another person to assist. 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 the laser on a level floor that is at least 16' (1.5 m) long.
2. Move the Power/Transport Lock switch to the right (Figure
A3) to turn the laser ON in self-leveling mode and display
the horizontal and vertical beams.
3. Press (-) once to display the side vertical beam.
4. Measure exactly 3' (0.91 m) from the center of the laser unit
along the front vertical beam, and mark P1 (Figure G1).
5. Measure exactly 4' (1.22 m) out from the center of the laser
unit along the side vertical beam, and mark P2 (Figure G2).
6. Measure the distance between P1 and P2 (Figure G3).
7. If the distance between P1 and P2 is not 5' + 1/32" (1.522 m
+ 0.75 mm), please bring the laser unit to your nearest
STANLEY service center for calibration.
Horizontal Beam Accuracy
Checking the horizontal pitch calibration of the laser requires a
single wall at least 30' (9 m) long. 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 the laser on a tripod facing the corner of a room
(Figure E1).
2. Move the Power/Transport Lock switch to the right (Figure
A3) to turn the laser ON in self-leveling mode and display
the horizontal and vertical beams.
3. Aim the vertical beam at a corner of the room.
4. Where the horizontal beam crosses the center of the
adjacent wall, mark P1.
5. Turn the laser so the vertical beam crosses P1 (Figure E2).
6. Where the horizontal beam crosses the vertical beam,
mark P2.
7. Turn the laser so the vertical beam is aimed at the second
corner (Figure E3).
8. Where the horizontal beam is vertically in line with P1 and
P2, mark P3.
9. Measure the vertical distance between the highest and
lowest points (between P1, P2, and/or P3).
10. If your measurement is greater than the Allowable Distance
Between Highest & Lowest Points for the corresponding
Distance Between Walls in the following table, the laser
must be serviced at an authorized service center.
Distance Between
a and b
Allowable Distance Between
highest & lowest Points
30' (9 m) 1/4" (6 mm)
40' (12 m) 5/16" (8 mm)
50' (15 m) 13/32" (10 mm)
Distance Between
Walls
Allowable Distance Between
P1 & P3 or P2 & P4
30' (9 m) 1/8" (3 mm)
40' (12 m) 5/32" (4 mm)
50' (15 m) 7/32" (5 mm)
3. Aim the vertical laser beam toward the door jamb.
4. Along the bottom of the laser beam, mark three locations a,
b, and c; where b is midway between a and c .
5. Where the top of the laser beam appears at the top of the
door jamb, mark e .
6. Move the laser to the opposite side of the door jamb
(Figure F2).
7. Align the bottom of the laser beam with a, b, and c.
8. Where the top of the laser beam appears at the top of the
door jamb, mark f.
9. Measure the distance between e and f.
10. If your measurement is greater than the Allowable Distance
Between e and f for the corresponding Ceiling Height D
in the following table, the laser must be serviced at an
authorized service center.
Ceiling height D Allowable Distance Between
e and f
6.56' (2.0 m) 1/16" (1.5 mm)
8.20' (2.5 m) 3/32" (2.0 mm)
9.84' (3.0 m) 1/8" (2.5 mm)
Vertical Beam Accuracy
Checking the vertical (plumb) calibration of the laser can be
most accurately done when there is a substantial amount of
vertical height available, ideally 30' (9 m), with one person on
the floor positioning the laser and another person near a ceiling
to mark the position of the beam. 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 the laser at least 3.28 ft (1.0 m) from a door jamb
(Figure F1).
2. Move the Power/Transport Lock switch to the right (Figure
A3) to turn the laser ON in self-leveling mode and display
the horizontal and vertical beams.
USING THE LASER
Operating Tips
• Always mark the center of the beam created by the laser.
• Extreme temperature changes may cause movement of
internal parts that can affect accuracy. Check your accuracy
often while working.
• If the laser is ever dropped, check to make sure it is
still calibrated.
• As long as the laser is properly calibrated, the laser is self-
leveling. Each laser is calibrated at the factory to find level as