Plumb Bob - Best Tools for the Weekend Warrior - DIY Essentials - Bob Vila
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You don’t need a graduate degree in physics to understand that a string suspended with a weight at the bottom will be both precisely vertical, or "plumb," AND perpendicular to any level plane through which it passes. The plumb bob, obviously, is the companion tool to the level. Well-machined and well-balanced bobs have pointed tips that make them more precise to use.