The Lyman Stainless Steel Dial Caliper has a range of 0 to 6 inches and is guaranteed accurate within 0.001 inches. These calipers are made from stainless steel to ensure a lifetime of top performance and come with a hard protective storage case as well. These Lyman Stainless Steel Dial Calipers offer serious reloaders like you a fast and easy way to measure your cartridge case lengths as well as primer pocket diameters. These calipers are so well-made that they will continue to provide accurate readings long after your favorite reloading dies become worn out.