Though you might get a good laugh out of this...
In my continuing bakefoolery, I was looking for a small vertical-sided glass or glass jar to use to measure bulk (and proof) fermentation. Couldn't find one, but spotted a clear plastic tube/container (that came with a "roll" of epoxy filler wrapped in plastic inside the tube). Looked perfect - tiny volume of dough needed to fill it but enough for an accurate test and had vertical walls.
Its about 1" in diameter and 5" tall.
Just had to add a few lines and numbers with MS Word to give it a "scale". (There's a little extra room below "1" because tube has a dimple in the bottom).