The Frankford Arsenal 6" Digital Caliper is an excellent tool for every reloading bench, measuring everything from the overall length of reloaded ammo to the diameter of cast bullets. This stainless steel caliper features a glass covered, high contrast LCD readout window, separate on/off buttons and a water and dust resistant surface. Included AccessoriesProtective Hard CaseOne 1.55 Volt Silver Oxide Battery Notes: CE Certified Battery Changing: To change the battery hold the caliper, LCD display facing up in the palm of your hand. Using your thumb push the tab with the triangle on top away from the LCD Display. This tab should pop right off and the battery can be accessed.