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The best of this sort of equipment is made in the US and sold through there. there are comparator sets of different types.... browse Sinclair international on-line. You-tube bullet comparators and you can see several videos that show you each type in use. They are in indispensable piece of reloading equipment. COAL only matters in mag feeding measurements.
I got the Stoney Pointe from Russell Sports in Calgary(when it was still around). It works fine, just slide it on to your caliper, tighten the set screw, put the right insert in for calibre, set the zero with the assembly closed and measure away.