Rotary Laser Bosch GRL 300 HV Professional — Bosch laser rotating level (model GRL 300 HV)

Bosch GRL 300 HV Professional is a rotary laser level designed for precise horizontal and vertical alignment on construction and surveying sites. This rotating laser produces a continuous 360° laser plane for elevation transfer, site layout and alignment checks. It is intended for professional use on outdoor and large-area interior jobs when paired with compatible receivers and tripods, offering reliable reference planes across long distances.

Advantages

The GRL 300 HV delivers stable 360° coverage with selectable vertical and horizontal planes to support a variety of alignment tasks. Its robust housing and intuitive controls allow rapid setup and consistent performance in typical jobsite conditions. When combined with a laser receiver, the instrument extends usable range for outdoor leveling and grade control, while tripod compatibility enables flexible positioning and repeatable measurement points.

Suitable for

• Establishing horizontal reference planes for concrete pouring, slab work and floor installation
• Transferring elevations across a site for grading and drainage checks
• Vertical alignment tasks such as wall layout, column placement and façade alignment
• General site layout and control when used with a laser receiver and tripod

Key specifications

• 360° rotating laser plane for continuous horizontal coverage
• Selectable horizontal and vertical laser modes for versatile alignment
• Designed for use with external laser receivers to extend outdoor range
• Robust professional-grade housing for on-site durability
• Tripod-compatible mounting for stable positioning and repeatability

How to use

Place the GRL 300 HV on a tripod or a stable surface and power the unit according to the manufacturer’s instructions. Select the required mode (horizontal, vertical or both) and allow the unit to stabilize; the rotating head will create a continuous laser plane. For outdoor or long-range applications, use a compatible laser receiver to detect the beam and determine differences in elevation. Mark reference points or adjust instrument height as needed to transfer elevations or align elements across the site.

Usage recommendations

To achieve accurate results, mount the instrument on a stable, vibration-free tripod and verify level before use. Use a compatible Bosch laser receiver when working outdoors or beyond the visible-range of the laser beam, and follow safety guidelines for laser products by avoiding direct eye exposure and using appropriate protective measures.