I inherited two, but, rarely if ever, use them. As a kid playing around with my dad's I would alway pinch my fingers. They don't lay flat and the thickness makes it hard to measure and mark accurately. I tried using the the sliding brass tip for inside dimensions, but I would routinely bump it off the mark. I guess they are ok for framing but not cabinet work; at least for me. On my table saw I use the installed tape, the Wixey digital fence, or a flat SS rule when using my primitive Xcut sled. I bought the Lee Valley doodads and used some hardwood sticks to made an inside dimension measuring stick. I use that to measure the diagonals when checking for squareness of drawer boxes and cabinets. I use the tail of my calipers for dado depth, and blade and bit height measurements.