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Figure 2.15 shows three fixed-diameter gauges, and a vernier calliper which you’ll find especially useful for smaller items which have several different diameters which you want to calliper.

Figure 2.15 A vernier calliper and three fixed-diameter gauges.

Look for a brand of vernier calliper which has a large and strong locking knob. Mine has both imperial and metric rulings.

I’ve filed the inside corners of the calliper’s and gauges’ jaws round so that the jaws don’t grab as the desired diameter is achieved.