8
GB
Contents
• Laser Information
• User Safety
• Battery Safety
• Installing AA Batteries
• Turning the Laser On
• Checking Laser Accuracy
• Using the Laser
• Maintenance
• Troubleshooting
• Service and Repairs
Laser Information
The STHT77498-1 and STHT77499-1 lasers are Class 
2 laser products. The lasers are self-leveling laser 
tools that can be used for horizontal (level) and vertical 
(plumb) alignment projects.
User Safety
Safety Guidelines
 
 
DANGER: Indicates an imminently 
hazardous situation which, if not avoided, 
will result in death or serious injury.
  WARNING: Indicates a potentially 
hazardous situation which, if not avoided, 
could result in death or serious injury.
 CAUTION: Indicates a potentially hazardous 
situation which, if not avoided, may result in 
minor or moderate injury.
NOTICE: Indicates a practice not related to 
personal injury which, if not avoided, may result in 
property damage.
If you have any questions or comments about this 
or any STANLEY
®
 tool, go to  
http://www.STANLEY.com.
WARNING:
Read and understand all instructions. 
Failure to follow the warnings and 
instructions in this manual may result in 
serious personal injury.
SAVE THESE INSTRUCTIONS
WARNING: 
Laser Radiation Exposure. Do not 
disassemble or modify the laser level. 
There are no user serviceable parts 
inside. Serious eye injury could result.
WARNING:
Hazardous Radiation. Use of controls or 
adjustments, or performance of procedures, 
in hazardous radiation exposure. 
Symbol Meaning
V Volts
mW
Laser Warning
nm Wavelength in nanometers
2 Class 2 Laser
Warning Labels
For your convenience and safety, the following 
labels are on your laser.
 
  WARNING: To reduce the risk of 
injury, user must read instruction 
manual.
   WARNING: LASER RADIATION. DO 
NOT STARE INTO BEAM. Class 2 
Laser Product.