| 摘要 |
A headlight of vehicle consists of a lens, a housing which encloses the backside of the lens, a lamp and a reflex mirror inside. A level(5) is secured on the rear of the reflex mirror(3) in the housing(4). The housing(4) being the same position as the level(5) has a transparent glass which is carved with scale marks(6). Irradiation angle of the headlight up and down is measured by the location of an air drop(8) of the level(5). The reflex mirror in the housing(4) of the headlight is followed by the level(5) so that a user can check the location of the air drop(8) of the level by eyes.
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