Magnetic field of the rare earth magnets is redirected by an iron plate and thus reinforced for optimum holding force. Easy to read inclination by additional rings (10 mm or 20 mm per metre) in each direction. Reinforced acrylic vials for a long service life. Easy positioning on round materials to be welded thanks to recess for weld seams. V-groove for easy positioning on pipes and round materials. Laser-marked measuring scale for quick measurement of lengths up to 15 cm. Compact design, with a bevelled end for easy storage in the pocket.