There is an application
on a device called ToolBox, which allows you to turn your device into a
ruler, mirror, and use it to level surface or understand directions using a
compass.
These skilled workers are also responsible for adding figures or designs
on stone by freehand drawing, for transferring dimensions from blueprints with the use of a chalk,
rulers or
compass or for choosing pneumatic tools and determining their use according to strict figures or designs.