A ruler with a slot is described herein. The slotted ruler may include a plurality of widthwise and lengthwise lines that form different sized rectangles and squares located above and below the slot for measuring. The lines may be spaced at fractional metric or imperial intervals. The slotted ruler may further include a plurality of hatch marks. The slotted ruler may further include a set of at least the numbers one, two, three and four spaced 1 centimeter or 1 inch apart located above the slot, an aligned set of numbers located below the slot, as well as an offset set of numbers.

A multifunctional writing device includes a hollow body, wherein the hollow body comprises one or more cavities configured to store a mechanical pencil, a multifunctional drawing tool, a compass needle, a stylus, an eraser, a USB flash drive, an imaging system, a projector pen, a set of cameras, and attaches a projector stick. The first writing member comprises a mechanical pencil system being provided in a first portion of the hollow body and a touch ID sensitive barrel. A second projector member comprises a projector pen and attaches a projector stick. The first portion of the hollow body is at the opposite end of the second portion of the hollow body. The multifunctional writing device allows for projecting self-leveled and auto calibrated geometry drawing tools. A method for digitizing the written data on paper and a system for secure, auto proctored, and auto grading of examinations is provided.

A combinational template and scale ruler to accurately draw three-dimensional (3D) drawing is disclosed. The scale ruler is a transparent plate, which includes a plurality of apertures disposed at a middle portion. Each aperture defines a substantially continuous linear aperture corresponding to a visible edge of 3D shape. A plurality of indicium is juxtaposed around each aperture to facilitate drawing of the 3D shape. The plurality of indicium is inscribed in surface of the scale ruler. The plurality of indicium is graduated to define angle and size factor of the aperture to facilitate drawing of the 3D shape. The plurality of indicium further includes 3D shape of a cube of the aperture. The plurality of indicium includes information regarding the classification of the 3D shape. The plurality of apertures is arranged in groups and subgroups of the groups based on a type of projection of the 3D shape.

A multifunctional writing device includes a hollow body, wherein the hollow body comprises one or more cavities configured to store a mechanical pencil, a multifunctional drawing tool, a compass needle, a stylus, an eraser, a USB flash drive, an imaging system, a projector pen, a set of cameras, and attaches a projector stick. The first writing member comprises a mechanical pencil system being provided in a first portion of the hollow body and a touch ID sensitive barrel. A second projector member comprises a projector pen and attaches a projector stick. The first portion of the hollow body is at the opposite end of the second portion of the hollow body. The multifunctional writing device allows for projecting self-leveled and auto calibrated geometry drawing tools. A method for digitizing the written data on paper and a system for secure, auto proctored, and auto grading of examinations is provided.

A multifunctional writing device comprising a hollow body, wherein the hollow body comprises one or more cavities configured to store a protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, a set square forty-five-degree (45) triangle, a compass needle, a USB flash drive, a stylus, and an eraser. A first writing member comprises lead and a mechanical pencil system being provided in a first portion of the hollow body. A second writing member comprising a pen system being provided in a second portion of the hollow body. A magnetic lock attaches and stores a protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, a set square forty-five-degree (45) triangle, and a compass needle inside a cavity. A protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, and a set square forty-five-degree (45) triangle are removed from a cavity by pulling rectangular strip top portion.

A multifunctional writing device comprising a hollow body, wherein the hollow body comprises one or more cavities configured to store a protractor, a ruler, a set square thirty/sixty-degree (30/60)triangle, a set square forty-five-degree (45) triangle, a compass needle, a USB flash drive, a stylus, and an eraser. A first writing member comprises lead and a mechanical pencil system being provided in a first portion of the hollow body. A second writing member comprising a pen system being provided in a second portion of the hollow body. A magnetic lock attaches and stores a protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, a set square forty-five-degree (45) triangle, and a compass needle inside a cavity. A protractor, a ruler, a set square thirty/sixty-degree (30/60)triangle, and a set square forty-five-degree (45) triangle are removed from a cavity by pulling rectangular strip top portion.

The line-marking tool attaches to a pad of paper. The line-marking tool comprises an anchored straight edge, a rotating straight edge, and a slewing bearing. The slewing bearing attaches the rotating straight edge to the anchored straight edge. The anchored straight edge attaches to the pad of paper such that the position of the anchored straight edge relative to the top sheet of the pad of paper is fixed. The anchored straight edge and the rotating straight edge are used to draw straight lines on the top sheet. The slewing bearing adjusts the cant of the rotating straight edge relative to the anchored straight edge such that a cant is formed between a line drawn using the rotating straight edge and a line drawn using the anchored straight edge. The slewing bearing is calibrated to form a precise angle of cant on the top sheet.

A straight-edge drawing guide comprising a base having an elongated 90-degree member attached to one edge and capable of being moved along a planar surface. An angular measuring device allows a user to adjust the position of the guide to any angle relative to a desired datum. A user can then use a marking device adjacent to the guide to produce substantially straight lines.

The adjustable laser line, level, and square is a leveling tool. The adjustable laser line, level, and square comprises a pedestal, a slewing bearing, a stanchion, a drafting triangle, and a laser. The laser and the drafting triangle are attached to the stanchion. The slewing bearing attaches the stanchion to the pedestal. The laser generates a straight beam of light that is used to form a straight line along the surface. The adjustable laser line, level, and square allows for the adjustment of both the azimuth angle and the polar angle of the laser. The slewing bearing is used to adjust the azimuth angle. The drafting triangle is used to adjust the polar angle. The stanchion further comprises a plurality of bubble levels that measure the angle of the stanchion relative to the force of gravity.

A plotter apparatus inscribes a polygon in a circle, and includes a ruler body, a first slider, a second slider, multiple brachiums, and a nib member. The ruler body comprises a knap, and a first ruler groove and a second ruler groove to allow movement of the first slider and the second slider. The brachiums are connected across the ruler body via pivots. The nib member allows the drawing of the circle. A fourth brachium is attached to a predetermined numbered hole on a second and a third brachium as per the number of sides required on the polygon. The length of each side of the polygon is retrieved between the knap and a slider. Cyclic arcs, with the determined length as a length of one side of the polygon, are drawn along the circumference of the circle. The arc intersections on the circle are joined together to define the polygon.