1.可⽤于测量内径尺⼨ For internal measurements. 2.⼯作⾏程4mm Contact point moving range: 4mm 3.百分表完全⽤坚固的防护罩保护 With indicator protective cover. 4.插⼊式可换测头，使⽤⽅便，测量范围⼤ Interchangeable contact points, easy to use, wide measuring ranges.
