1.ON/OFF开/关机 Manual power on off. 2.任意位置清零 Zero setting at any position. 3.mm/in任意位置公英制转换 Metric/Inch system conversion at any position. 4.可进行外尺寸、内尺寸、台阶尺寸及深度尺寸测量 Can measure OD,ID,steps and depth.