There is a diameter of 3mm and a line thickness of 0.1mm outside the scale line, so as to find line when focusing.
Small size, and portable.
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.
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.