Abstract: An adjustable construction square is provided that comprising an elongated blade member and an elongated cross member. An end of the cross member has a contour, and an end of the blade member has a contour. The adjustable construction square includes a clamping jig that enables the construction square to be quickly secured into a desired angular position. The clamping jig includes a clamping device, a wedge device, and an arm that work in combination to secure the adjustable construction square in a desired position.

Abstract: An adjustable construction square is provided that comprising an elongated blade and an elongated cross member coupled to the blade. The elongated blade has a longitudinal axis and linear measurement indicia on one of its surfaces. The elongated cross member also has a longitudinal axis, and has top and bottom surfaces with measurement indicia on its top surface. An end of the blade member is coupled to an end of the cross member. The end of the blade member that is coupled to an end of the cross member has a contour, and the end of the cross member that is coupled to the blade member has a contour. This arrangement and contoured ends allow accurate measurements in certain construction applications. The adjustable construction square includes a clamping jig that enables the construction square to be quickly secured into a desired angular position. The clamping jig includes a clamping device, a wedge device, and an arm that work in combination to secure the adjustable construction square in a desired position.