Abstract: An adjustable squaring tool for measuring and marking angles includes a pivot arm pivotally coupled between first and second sections of a main member. The pivot arm having a graduated arcuate measurement arm extending from the pivot arm through a channel in the main member. The pivot arm having a cylinder coupled to an end of the pivot arm. The main member includes a drum passing through the cylinder. The cylinder has a plurality of radially spaced apertures corresponding to the gradations of the measurement arm. The drum includes at least one spring biased bearing positioned for engaging apertures in the cylinder as the cylinder rotates around the drum. A locking assembly is provided for clamping the pivot arm between the first and second sections of the main member to lock the pivot arm relative to the main member. In an embodiment the apertures are spaced for adjusting the tool in one degree increments between 10 degrees and 90 degrees.

Abstract: A carpenter's level is formed in two sections, connected together by a pivot near the top of the sections whereby the level may be adjusted to various positions including at least a straight, linearly aligned position and a right angle position. When in the linear configuration, the surfaces of two cooperating sections are flush, without protrusions. A pair of extending flanges on the main section overlap the other, adjustable section by extending into complementarily shaped recesses in the sides of the adjustable section, and the adjustable section includes a projecting insert which extends into a recess formed in the main section, so that the flanges, recesses and insert cooperate to provide stability and alignment of the two sections. Position-holding projections on the inside surfaces of the extending flanges are engageable with sets of depressions formed in the recesses of the adjustable section, positioned to hold the two level sections at selected angles.