| 摘要 |
A level having an adjustable mechanism for truing to acquire an exact reading which comprises an elongated rigid body being an I-shaped frame having a web with a first flange transversely extending across a first long end of the web and a second flange transversely extending across a second long end of the web. A first bubble vial is mounted in a parallel relationship within the center of a first elongated rectangular plate for taking horizontal measurements. A second bubble vial is mounted in a transverse relationship within the center of a second elongated rectangular plate for taking vertical measurements. A mechanism is for securing the first elongated rectangular plate in an adjustable manner to one face of the web and the second elongated rectangular plate in an adjustable manner to an opposite face of the web. The first bubble vial in the first elongated rectangular plate and the second bubble vial in the second elongated rectangular plate can be adjusted true with respect to the web to acquire an exact reading when being used for the horizontal and vertical measurements.
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