US Patent 7676940 Level

A level includes a body having first and second arms attached to each other for relative pivotal movement about a pivot axis between open and closed positions. The level also includes a bubble vial mounted to the body and having a longitudinal axis coaxial with the pivot axis. Movement of the arms from their closed position to their open position exposes a measurement portion of the first bubble vial for use. Movement of the arms from their open position to their closed position shields the measurement portion of the first bubble vial within the body to protect the bubble vial from damage during storage.