I did some digging... I forgot that the comparator was called the "Head and Shoulder" when it was being sold by Stoney Point... Hornady must have bought Stoney point, because I have both of these comparators, but I bought them as Stoney Point products.

The upside of the comparators is that they can be used on multiple cartridges vs. the precision mic which is cartridge specific.

http://www.midwayusa.com/find?userSe...ry=Comparators

http://www.midwayusa.com/find?userSe...Precision+mic+