| 摘要 |
A measuring instrument is disclosed to level, square and plumb adjacent and opposite surfaces of cylindrical, curved, inclined and planar shaped objects. A body member having right-angular arms with mutually perpendicular included-angle grooves for accommodating the contacted object surfaces being measured is an embodiment of the invention. Means to indicate the degree of level in the horizontal and vertical planes throughout 360 DEG are provided in each arm and include liquid or "bulls-eye" target vials. Alternatively, a single level means may be utilized in either right-angular arm member.
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