One common problem is using rulers and protractors. I worked with a local engineering designer to come up with a solution. The result is the Mush i Grip, which can be attached to a ruler or protractor to enable them to be manipulated with ease.
Ruler and Protractor with Handle
Handles for Rulers, Protractors, etc
If you are intested in purchasing one of these items, please contact me via phone or email. Or you can buy here: tOTallygripped on Etsy.