Comparison with Bosch GTL3 and GTL2. Bosch is accurate to 20 feet at 1/8" line width, 7/16" line width at 35 feet. I wish the Stabila had a 45 degree line like the GTL3! In tile layout, the third line is mandatory for square tiles, it gives the middle reference point for aligning the next row of tiles. Stabila saves time as the edge guides automatically align with the edge of the tile (when the tile is perfectly square). .