ENGLISH
5
 
WARNING: Read and understand all instructions. 
Failure to follow the warnings and instructions in this 
manual may result in serious personalinjury.
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 
couldresult.
 
WARNING: Hazardous Radiation. Use of controls 
or adjustments, or performance of procedures, other 
than those specified herein may result in hazardous 
radiationexposure.
The label on your laser may include the followingsymbols.
Symbol Meaning
V Volts
mW Milliwatts
Laser Warning
nm Wavelength in nanometers
2 Class 2 Laser
•  Do not operate the laser in explosive atmospheres, 
such as in the presence of flammable liquids, gases, or 
dust. This tool may create sparks which may ignite the dust 
orfumes.
User Safety
Safety Guidelines 
The definitions below describe the level of severity for each 
signal word. Please read the manual and pay attention to 
thesesymbols.
 
DANGER: Indicates an imminently hazardous situation 
which, if not avoided, will result in death or seriousinjury.
 
WARNING: Indicates a potentially hazardous 
situation which, if not avoided, could result in death or 
seriousinjury.
 
CAUTION: Indicates a potentially hazardous 
situation which, if not avoided, may result in minor or 
moderateinjury.
NOTICE: Indicates a practice not related to personal injury 
which, if not avoided, may result in propertydamage.
If you have any questions or comments about this or any 
STANLEY® tool, go to http://www.STANLEY.com.
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) alignmentprojects.
SELF-LEVELING 360º CROSS-LINE LASER 
STHT77498-1,  STHT77499-1  
•  Store an idle laser out of reach of children and other 
untrained persons. Lasers are dangerous in the hands of 
untrainedusers.
•  Tool service MUST be performed by qualified repair 
personnel. Service or maintenance performed by unqualified 
personnel may result in injury. To locate your nearest Stanley 
service center go to http://www.2helpU.com.
•  Do not use optical tools such as a telescope or transit to 
view the laser beam. Serious eye injury could result. 
•  Do not place the laser in a position which may cause 
anyone to intentionally or unintentionally stare into the 
laser beam. Serious eye injury couldresult.
•  Do not position the laser near a reflective surface which 
may reflect the laser beam toward anyone’s eyes. Serious 
eye injury couldresult.
•  Turn the laser off when it is not in use. Leaving the laser on 
increases the risk of staring into the laserbeam.
•  Do not modify the laser in any way. Modifying the tool 
may result in hazardous laser radiationexposure.
•  Do not operate the laser around children or allow 
children to operate the laser. Serious eye injury mayresult.
•  Do not remove or deface warning labels. If labels are 
removed, the user or others may inadvertently expose 
themselves toradiation.
•  Position the laser securely on a level surface. If the laser 
falls, damage to the laser or serious injury couldresult.
Personal Safety
•  Stay alert, watch what you are doing, and use common sense 
when operating the laser. Do not use the laser when you are 
tired or under the influence of drugs, alcohol, or medication. A 
moment of inattention while operating the laser may result in 
serious personalinjury.
•  Use personal protective equipment. Always wear eye 
protection. Depending on the work conditions, wearing 
protective equipment such as a dust mask, non-skid 
safety shoes, hard hat, and hearing protection will reduce 
personalinjury.
Tool Use and Care
•  Do not use the laser if the Power/Transport Lock switch 
does not turn the laser on or off. Any tool that cannot be 
controlled with the switch is dangerous and must berepaired.
•  Follow instructions in the Maintenance section of this 
manual. Use of unauthorized parts or failure to follow 
Maintenance instructions may create a risk of electric shock 
orinjury.