a multi - purpose , multi - function tool of compact design made up of a plurality of components having levels thereon which interact together to provide a single tool which can perform a number of various functions or purposes within the design or construction industry . the tool having a support of predetermined thickness and being of a substantially triangular - shaped configuration defining a pair of legs and a hypotenuse . an edge member is situated on one of the legs of said support structure , the edge member being of a predetermined thickness greater than the predetermined thickness of the support structure for supporting the support structure on a surface . a rotatable member is pivotally mounted on the support structure for selective rotational movement with respect thereto and a curved extension protruding from the rotatable member having degree and rise markings thereon . a locking mechanism is operably interconnected with the curved extension to hold the curved extension and rotatable member in a selected position with respect to the support structure .