Which instrument emits a narrow beam of light used in layout work?

Which instrument emits a narrow beam of light used in layout work?

• A. Theodolite
• B. Bubble level
• C. Laser
• D. Transit

Answer: (C)

For layout work you need a precise reference line projected onto the surface, and a laser provides exactly that. It emits a narrow, collimated beam that can be aligned to horizontal or vertical planes and projected across walls, floors, or cabinets. This lets you transfer measurements and align components with high accuracy over distances, making it ideal for laying out features. The other tools aren’t used to project a layout line: a theodolite and a transit are used to measure angles and sight lines rather than project a continuous reference beam, and a bubble level shows level using a liquid-filled vial rather than emitting light.

For layout work you need a precise reference line projected onto the surface, and a laser provides exactly that. It emits a narrow, collimated beam that can be aligned to horizontal or vertical planes and projected across walls, floors, or cabinets. This lets you transfer measurements and align components with high accuracy over distances, making it ideal for laying out features.

The other tools aren’t used to project a layout line: a theodolite and a transit are used to measure angles and sight lines rather than project a continuous reference beam, and a bubble level shows level using a liquid-filled vial rather than emitting light.