The is a heavy‑duty rotary laser built for real jobsite use — and I mean real, like muddy, dusty, wet concrete pours and early morning layouts where you know you’ve got to trust your laser every time. It’s a professional‑grade instrument designed to throw a 360° reference plane for horizontal and vertical work out to long distances outdoors. You get a rotary head that spins at selectable speeds so the beam stays visible in bright conditions, and that matters a lot out on big earthworks or setting elevations on a slab.From grading to alignment, this isn’t some toy you pull out once in a while — it’s made to work all day long and keep hitting the marks you set.

Here’s the thing — the GRL 350 HV isn’t just another laser level: its manual dual slope control lets you dial in changes on two axes, so when you’re laying drainage, ramps, or sloped slabs, you’re not guessing — you’re controlling grade with confidence. That kind of flexibility isn’t just convenient; on big jobs it saves hours of time and cuts out a bunch of guesswork.

Key Features:

• 360° Rotary Projection - Throws a continuous reference plane around the entire site so you don’t have to constantly move it.
• Manual Dual Slope Control - Lets you set and maintain precise gradients in two directions for grading and drainage work.
• Adjustable Rotation Speed - Keeps the laser visible in sunlight or shade by matching spin rate to conditions.
• IP56 Dust & Water Protection - Built for daily use in harsh environments with solid resistance to dust and water ingress.
• Long Working Range - When paired with a receiver, covers a wide area — up to several hundred metres — so big sites aren’t an issue.

Applications

This rotary laser is ideal for site layout and grading on construction and civil projects, where you’ve got to set elevations over long distances and keep things straight. Contractors use it for slab height checks, formwork alignment, slope control on roads or drainage swales, and even vertical alignment tasks on walls or columns. It shines outdoors when paired with a laser receiver, letting you work past the direct visibility limits of the beam itself and still nail your reference plane.

Why Choose This Model

If you’re tired of handheld levels or line lasers that struggle to stay visible outside, this model’s long range and slope capability make a real difference. You’re getting a tool that doesn’t quit halfway through a layout because the light changed or the terrain got rough. And the dual slope function gives you control you don’t find on cheaper rotary lasers — it’s a genuine pro‑level feature that helps keep your work tight from start to finish.

Technical Specifications Explained

• Working Range without Receiver - About 60 m, handy for quick indoor or small outdoor checks.
• Working Range with Receiver - Up to 350 m diameter so you don’t have to constantly reposition on big sites.
• Accuracy - Around ±1.5 mm @ 30 m horizontal and ±3 mm @ 30 m vertical — tight enough for slabs and fine grade work.
• Self‑Levelling Range - ±5° (about 8%), which means the laser will auto‑level within this range so setup is quick and reliable.
• Battery Runtime - Up to ~30 hours on D‑cells, so you can get a full day in without swapping power.

Who Should Buy This

If your day involves big outdoor layouts, slab elevations, or grading work that demands accuracy over distance, this Bosch laser is made for you — especially if you’re done with line lasers that barely show in daylight. The professional rotary laser category is where this sits, and it’s the kind of kit that pays for itself by cutting layout time and rework. It’s not a weekend DIY toy — it’s a tool for surveyors, contractors, and serious tradespeople who need a dependable reference plane day after day.

In short — if you’re running sites where precision matters and the conditions aren’t always perfect, this tool’s got what it takes to keep your work tight and your crew moving.