Installing shelves starts with precise wall holes for the brackets. Get it wrong, and it's a patching nightmare.
Skip the hassle of measuring directly on the wall.
Grab a strip of tape to capture the exact distance between holes.
Not sure? See for yourself:

And in video form, it's even clearer:
1. Measure the distance between the two holes using tape.
2. Stick the tape on the wall at shelf height – the ends mark your spots perfectly.
Perfect alignment every time. Far more accurate, no misplaced holes or rework.