The tile laser already helped me many a time during the renovations. I have thus laid tiles in three rooms and am very happy with the result. The largest room was 5x5 meters in size. From 4 meters, the laser beam is slightly wider and therefore less accurate, but to still use them. When repainting of walls, the laser helps the exact masking if you want to make for example a wall two-tone. However, a star I pull off, because with my new laser out of the box the battery contacts were oxidized. After cleaning the contacts, but the device is running without errors and performs still good services. Recommended home improvement very.