The composite micrometer is 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 are 1mm, into 100 equal point, each point value is 0.01mm cross figure.
There is 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.
It is mainly used with electronic eyepieces, microscope cameras and imaging software to measure microscopical objects.