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Laser Levels

Tradesperson in work gloves fitting a Grettz green beam multi-line laser to a wall bracket, with bright green 360-degree laser lines projected across a grey blockwork wall

What Is a Green Beam Multi-Line (4D) Laser Used For?
What a green beam multi-line (4D) laser actually does, the jobs it's built for, and how to decide between a 4D laser, a cross-line laser and a rotary laser.

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Builder in hi-vis and hard hat checking a reading on a levelling staff against a stone wall, with a Grettz green rotary laser level set up on a tripod in the foreground

Laser Level Accuracy Explained: What ±mm/m Really Means
What laser level accuracy figures like ±2mm at 10m actually mean on site, how error grows with distance, and how to make sure your laser is still hitting spec.

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Grettz green rotary laser level on an aluminium tripod with an LR receiver and red-graduated levelling staff clamped alongside, ready for levelling a floor

How to Level a Concrete Floor With a Laser Level
A practical step-by-step guide to checking levels, setting a datum and pouring or screeding a concrete floor flat using a rotary laser level.

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Grettz G4D green beam multi-line laser mounted on a wall bracket projecting bright green horizontal and vertical laser lines across an interior first-fix room with timber

Red vs Green Beam Lasers: What Actually Changes?
Green can appear easier to see, but colour alone does not decide which laser is right for the job.

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