Construction and Building

1. General Contractors – For checking straightness and leveling across various projects.
2. Builders – Ensuring precise measurements for walls, floors, and frameworks.
3. Carpenters – For marking, cutting, and aligning wood pieces.
4. Bricklayers – Checking the alignment of bricks and ensuring straight courses.
5. Concrete Contractors – Leveling and smoothing freshly poured concrete.
6. Masons – Verifying the flatness of stone or brick surfaces.
7. Roofers – Ensuring proper alignment of roofing materials and structures.

Flooring and Tiling

1. Flooring Installers – Ensuring level surfaces for hardwood, vinyl, or tile installations.
2. Tile Setters – For aligning tiles and creating straight grout lines.
3. Screeders – Leveling floor screed for smooth, flat surfaces.

Plastering and Drywall

1. Plasterers – Smoothing and leveling plaster on walls and ceilings.
2. Drywall Installers – Checking the straightness of drywall seams and edges.
3. Ceiling Installers – Aligning drop ceilings or plasterboard ceilings.

Landscaping and Outdoor Construction

1. Landscapers – Leveling soil, paving stones, and outdoor structures.
2. Paving Contractors – Ensuring even installation of driveways, paths, and patios.
3. Decking Installers – Checking straightness and alignment of wooden or composite decking boards.
4. Fencing Contractors – Aligning fence posts and panels.

Metalwork and Welding

1. Metal Fabricators – Ensuring straight cuts and alignments in metal sheets and frameworks.
2. Welders – Verifying straight seams and precision joints in metalwork.

Painting and Decorating

1. Painters and Decorators – For marking straight edges and ensuring crisp, clean lines on walls or trim.

Specialist Trades

1. Glass Installers – Ensuring flat and straight edges for window frames and panels.
2. Industrial Flooring Contractors – Smoothing and leveling resin or epoxy floors.
3. Stonemasons – Checking the flatness and alignment of stonework.

DIY Enthusiasts

1. Home Improvement Hobbyists – For personal renovation projects like laying tiles, installing flooring, or assembling furniture.
2. Gardeners – Leveling soil for small-scale landscaping projects.