Laser Levels & Layout Lasers

Laser levels project lines and dots to set grades, align walls and hang ceilings. Most are low-power, but a laser beam can still damage eyes, and a bright beam can distract a worker at a bad moment.

• Carpenters
• Surveyors
• Installers

Laser classes

• Class 1: safe under normal use.
• Class 2: visible low-power lasers (under 1 mW). The blink reflex protects eyes, but do not stare into the beam.
• Class 3R: up to 5 mW. Direct viewing is a hazard, though risk is lower than higher classes.
• Class 3B and 4 are not for ordinary layout work and need extra controls. See RF, Microwave & Laser Hazards.

The class is printed on the label. Check it before use.

Eye and site safety

• Never point a laser at anyone's eyes or look into the beam, including reflections.
• Set up the laser above or below eye level of people working nearby, where practical, and on a stable tripod or mount.
• Avoid shiny surfaces, mirrors and glass that can reflect the beam into someone's eyes.
• Turn the laser off when it is not needed, and when moving it.
• Post a warning sign if required for higher-class lasers, and tell nearby crews.
• Do not use laser eyewear for red or green laser "viewing glasses" instead of safety glasses; they are enhancers, not protection, unless rated. See Laser Safety Eyewear.
• Do not stare at the receiver or detector.
• Do not take apart, repair or modify the laser.

Using it well

• Check accuracy using the maker's method before important work
• Use fresh batteries and a charger designed for the tool; do not leave batteries in heat
• Protect the unit from drops, moisture and dust, and carry it in its case
• Use a receiver outdoors or in bright light
• Secure the tripod against traffic, wind and vibration
• Keep cords and tripod legs out of walkways

Last updated: October 8, 2026