| 摘要 |
<p>An improved laser level has a housing and a first shaft connected to the housing. Two bearings are disposed on the first shaft. A gimbal body is disposed on the two bearings. A second shaft is connected to the gimbal body. A third bearing is disposed on the second shaft. A pendulum is disposed on the third bearing. A laser diode is disposed on the pendulum. The housing is moveable between first and second positions, where the pendulum is self-levelling and not self-levelling respectively. A protrusion in an opening obstructs the laser beam when the housing is in the second position, but does not obstruct the laser beam when the housing is in the first position.
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