Line lasers project fixed lines onto walls, floors and ceilings and suit interior work such as cabinets, tile, framing and drop ceilings. Rotary lasers spin a beam 360 degrees and, with a detector, work over long distances outdoors for grading, foundations and site layout. Green beams look brighter to the eye than red indoors. Compare the accuracy spec, self-leveling range, working range with and without a detector, and the drop-test or IP rating.
Lasers replaced chalk lines and string for much layout work. The right type depends on where you work.
Compared
| Line laser | Rotary laser | |
|---|---|---|
| Beam | Fixed lines | 360° rotating beam |
| Best for | Interior: cabinets, tile, framing, ceilings | Exterior: grading, foundations, site work |
| Range | Short to medium; longer with detector | Long with detector |
| Price | Lower | Higher |
| Operation | Point and level | Tripod, detector, grade rod |
Line laser types
- Cross-line: one horizontal and one vertical line.
- 3-plane (3 × 360°): full lines around the room, ideal for layout.
- Point lasers: plumb and transfer points.
What to compare
- Accuracy at a stated distance.
- Self-leveling range and out-of-level warning.
- Visible range and detector range.
- Beam color: green for brighter indoor visibility.
- Durability: drop-test height and IP rating.
- Power: tool-brand battery or AA batteries.
Checking calibration
Check accuracy regularly using the maker’s procedure, often by marking a line on two opposite walls and comparing. Lasers knocked off a tripod should be checked before use.
Pair a laser with levels and squares, a sturdy ladder and your cordless platform.
Browse layout and measuring.
Common questions
Do I need a rotary laser for interior work?
Usually not. A cross-line or 3-plane line laser handles most interior layout. Rotary lasers shine outdoors and over long distances.
Is a green laser better than red?
Green beams appear brighter to the human eye, which helps indoors. They cost more and use more battery.
What is a laser detector?
A receiver that finds the beam when it is too faint to see, extending a laser's working range outdoors.
How accurate should a laser be?
Check the maker's accuracy spec at a stated distance and choose the tightest you can afford for your work. Check calibration regularly.