A contour gauge can be a useful tool for capturing cross-sectional shape, Figs. 15, 16. However, contour gauges work best over large curves where the resolution of the wires is not as critical. In the video below, I explain an alternative method for more accurately capturing small contours that we more likely encounter in scale modeling.
Surface gages are available in a number of different sizes, Fig. 17. I have modified an old gage by attaching a pin vise for holding leads. Surface gages are essential in ship building.
I use a lot of styrene strip and my favorite way to cut the strip material is with a “Chopper”, Fig. 19. I keep a piece of styrene clamped to one side to better support the strip and give me an edge to measure from to set the stop (dimension A), Fig. 20.
While I mostly reach for a few favorites, there are times where I use one of the more specialized sizes or shapes of tweezers, Fig. 21.