1X-544X 5.0M mini digital microscope 1, Factory Direct Sell 2, With ... length represented byevery bar is displayed on the right of the rule. Take the diagram below as an example ... everybar represents 0.1mm, you can calculate the length of the object according to the bars it takes up ... 3,Antique jewelry appraisal,money appraisal.4,observe the skin regeneration, 5,Plants and animals observation education and ...