An educational ruler is a protractor, where the protractor can draw and measure angles. The educational ruler includes a planar disk having a semicircular circumference and labeled in scales along the semicircular circumference; a straight line edge connecting two edges of the semicircular circumference; a through hole on the planar disk; a first edge and a second edge extending from the through hole to the straight line edge; a third edge and a fourth edge extending from the semicircular circumference to the straight line edge. The first edge of the through hole of the educational ruler and the second edge of the through hole of the educational ruler intersect at 90 degrees scale of the planar disk to form the first right angle, and the included angle of the first edge of the through hole of the educational ruler and the straight line edge of the educational ruler is 45 degrees.

A set square for manual ceramic cutters, including a ruler intended to be rotatably mounted and secured to a base of a manual ceramic cutter, defining various angles; a stop that is mounted on the ruler and can be moved longitudinally; and a tightening element for securing to the ruler. The cross-section of the ruler includes two oblique planes that converge towards an intermediate surface provided with a longitudinal recess having a generally T-shaped cross section, for mounting the tightening element. The lateral stop includes two oblique planes facing the ruler and having the same slope as the oblique planes of the ruler, and which converge towards an intermediate surface that has an opening to mount the tightening element.

A marking alignment tool in the form of a saddle square is provided. The square has first and second legs that define orthogonal workpiece abutment planes and an alignment point. A continuous angle marking channel is provided through the first leg and extends through a top and bottom surface thereof. The channel provides a plurality of marking channel portions that are radially and angularly offset from one another such that a marking tool can be guided at predetermined angular locations relative to a side of a workpiece to form desired marks thereon.

A marking alignment tool in the form of a saddle square is provided. The square has first and second legs that define orthogonal workpiece abutment planes and an alignment point. A continuous angle marking channel is provided through the first leg and extends through a top and bottom surface thereof. The channel provides a plurality of marking channel portions that are radially and angularly offset from one another such that a marking tool can be guided at predetermined angular locations relative to a side of a workpiece to form desired marks thereon.

A squaring device includes a longitudinal square component configured to form a flange defining a slot therein, the slot adapted to rotatably receive a flat stock end. An L shaped square component includes a first outside edge and a second outside edge, the first and the second outside edges configured to form a flange defining a slot therein along a length of the flange, the flange adapted to rotatably receive one of the first forty-five degree and the second forty-five degree flat stock ends of the longitudinal square component. A magnetic clip is adjustable to fit either the flange end or the flat stock ends of the longitudinal square and the L square components via adjustable linear force sensitive pins, wherein a squaring device is formed and fixed magnetically and mechanically in place for pipe fitting by a combination thereof. Level indicators therein include magnifying lens and lighting.

A carpenter tool including a body having a first edge and a second edge, a bubble level carried in the body, the bubble level having a tubular sidewall terminating at opposed first and second closed ends. The tubular sidewall has a first section and a second section, wherein at least one of the first and second sections is parallel to at least one of the first and second edges. The first and second sections are oriented normally with respect to each other. The first and second sections are joined to each other in fluid communication and partially filled with a fluid and a bubble in the fluid, such that the bubble is enabled to move between the first and second sections freely.

A system, method, and apparatus for conveniently and accurately cutting material such as trim, tile, profiles, Schluter trim, or other such non-flat material which are difficult to hold steady, comprises a tool body, the tool body configured to have an adjacent side, an opposite side, and a hypotenuse, a hypotenuse slit formed in the tool body, a second slit formed in the tool body, and an indentation in the tool body.

A multi-purpose framer's speed square in the form of a right triangle comprising a top plate with a T-shaped edge and a series of etched top plate lines including framing top plate call outs, a notched front edge having a plurality of notches spaced along the length in increments, ruler etching callouts, and lumber width callouts denoting lumber sizes, and a hypotenuse edge having etched top plate lines, common rafter window plumb cut outs and a hip/valley section disposed above the hypotenuse edge having etched degrees and hip/valley roof rafter plumb cuts.

A system, method, and apparatus for conveniently and accurately cutting material such as trim, tile, profiles, Schluter trim, or other such non-flat material which are difficult to hold steady, comprises a tool body, the tool body configured to have an adjacent side, an opposite side, and a hypotenuse, a hypotenuse slit formed in the tool body, a second slit formed in the tool body, and an indentation in the tool body.