There is a with a diameter of 3mm and a line thickness of 0.1mm outside the scale line , so as to find line when focusing The scale is clear and the workmanship is exquisite Small size , lightweight and portable The composite micrometer is divide into five part There are four point with sizes of 1.5mm , 0.6mm , 0.15mm and 0.07mm There is a crosshair-scale in middle , the total length of X-axis and Z-axis scales are 1mm , divide into 100 equal point , each point value is 0.01mm cross figure It is mainly used with electronic eyepieces , microscope cameras and imaging software to measure microscopical objects, Manufacturer: Watreketal