1.ON/OFF開/關機 Manual power on off. 2.任意位置清零 Zero setting at any position. 3.mm/in任意位置公英制轉換 Metric/Inch system conversion at any position. 4.可進行外尺寸、內尺寸、臺階尺寸及深度尺寸測量 Can measure OD,ID,steps and depth.