Steno Gadgets & Accessories: Lines Of Text Ruler
Previously, when I needed to measure margins, I would use a paper ruler that as divided into the increments I needed. The paper ruler is on a page that is included in a Case CAT instruction manual I used in school. (I think the Case CAT program also came with a flexible ruler that can be used to measure margins.) However, I found a sturdier option.
The Westcott ruler I found was less than $5. It is a happily added addition to my steno gadgets and accessories.