三丰数显薄片外径千分尺422-230/422-231/422-232/422-233/422-260/422-261/422-270/ 产品说明 数显薄片外径千分尺编号规格422-2300-25mm分度值0.001mm测砧0.75*6mm422-23125-50mm422-23250-75mm422-23375-100mm422-2600-25mm测砧0.40*6mm422-26125-50mm422-2700-25mm钨钢测砧0.75*6mm422--2710-25mm钨钢测砧0.40*6mm