What is the name of the pictured tool that helps make sure everything is lined up properly?

A level is something not only every woodworker should have, but every homeowner too. It is used to ensure lines are horizontally even and not lopsided. Some of its more popular uses are making sure pictures are hung evenly and that a cut in a piece of wood will be straight.

Asked by Jennifer Sinclair · Last updated 5 years ago · 1.9M views · SOURCE