I use a Vernier caliper to measure OAL and it works well. I use the Hornady case gauge with it to measure the shoulder dimension to make sure casings fit in my rifle chambers. It also works well and is not fragile.
Member: Orange Gunsite Family, NRA--Life, Varmint Hunters' Assn., ARTCA, American Legion, & South Cuyahoga Sportsmen's Assn.
"Gunnery, gunnery, gunnery...all else is twaddle!" --Admiral Sir John Fisher, RN