Reloading ammunition requires attention to many critical cartridge dimensions, including case length, neck and base diameters, overall length, primer pocket depth, etc. Verifying these dimensions is quick and convenient with the Frankford Arsenal Calipers and Micrometers. The calipers are accurate to within .001" and the Micrometers are accurate to within .0001". The calipers allow you to measure inside and outside diameters, plus depths and displays the measurements on the LCD screen located on the front. You will find them useful for many measuring tasks on and off the reloading bench. Packaged in a convenient, protective case.