Fix a shelf to the wall

Here's how to fix a wall shelf quickly and accurately:

• Use the bubble against the riser to check verticality, then mark the position of the first upright on the wall.
• Drill, tessellate and screw the first upright.
• Now always using the bubble mark the holes of the next riser. If the bubble is not long enough use a batten to extend its usefulness.

In this way the shelf will remain perfectly leveled without having to take a thousand measurements. A fast and precise solution.