The marking device holder may comprise a body, an instrument holder, and a plurality of touch points. The marking device holder may be operable to move a writing instrument over a writing surface in a straight line. The writing instrument may detachably couple to the instrument holder such that the writing instrument contacts the writing surface. The plurality of touch points may form a stable base for the body that may resist tipping and may reduce friction during forward motion of the body. As non-limiting examples, the writing instrument may be a pen, a pencil, a mechanical pencil, a marker, or a stylus. As non-limiting examples, the writing surface may be paper or a device screen.

The marking device holder may comprise a body, an instrument holder, and a plurality of touch points. The marking device holder may be operable to move a writing instrument over a writing surface in a straight line. The writing instrument may detachably couple to the instrument holder such that the writing instrument contacts the writing surface. The plurality of touch points may form a stable base for the body that may resist tipping and may reduce friction during forward motion of the body. As non-limiting examples, the writing instrument may be a pen, a pencil, a mechanical pencil, a marker, or a stylus. As non-limiting examples, the writing surface may be paper or a device screen.

The tracing instrument, such as a ruler, set square or protractor, includes a main body with one or more lateral tracing elements. The tracing instrument includes sliding systems and gripping systems. The sliding systems include displacement devices chosen from among translation, rotation, deformation with respect to the main body and devices to facilitate movement/displacement of the tracing instrument. The tracing instrument can be made in several blocks. The main body associated with the gripping systems and the lateral tracing elements associated with the sliding systems are separated blocks. The main body is operable by pressing to perform a gripping. The tracing instrument can be for the school environment, in particular for children suffering from dyspraxia, however it can be extended to other uses.

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.

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.