I just measured the diameter of my Provari with a dial caliper and it reads at .895". I measured the diameter of a U.S. quarter and it measured right at .950" (both just under 1"). So if hold a roll of quarters in your hand, the Provari is approximately 1/20" thinner which isn't much, but it is thinner. And the Provari weighs about the same as a roll of quarters does with battery installed - heavier than you might think. A very solid feel in your hand.