Wood rules and tape measures are similar tools, and I've realized I almost always default to the tape measure. When should I be using a wood rule instead?
When is it appropriate to use a wood rule rather than a tape measure
measuringtools
Related Solutions
A better roller frame may actually be the right solution. I used this roller to paint most of my house after giving up on the cheap ones. It does a pretty good job of sealing the ends so that paint doesn't get inside to the rotating components. It's also got bearings to help it roll smoothly.
Unfortunately, I've used it only with Behr interior eggshell paint, so I can't tell you how it will do with primer.
EDIT: Mike B. reports good results with primer for the same roller.
Measure in a foot or so from one inside corner and make a mark. Then measure from the opposite corner to your mark. Add the two measurements together for the full length.
Note that this process is shown with pictures over on the blog.
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Best Answer
A measurement by a rule will usually be more accurate than a tape measure and will not bend. You can hold a rule against a flat object much more securely than can be done with a tape measure. Also, if you have a machinist's rule that is accurate to the end, you can scribe using the end of the rule, something that is impossible with a tape measure.