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 Small size, lightweight and portable The scale is clear and the workmanship is exquisite 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: Bottone