Features: Small size, lightweight 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. There is a circle with a diameter of 3mm and a line thickness of 0.1mm outside the scale line, so as to find line when focusing. 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. Specifications: Material: Plastic Accuracy: 0.01mm Measurement Range: 1Div=0.01mm Application for Electronic Eyepiece, Microscope Camera Size: Approx. 75x25x1.1mm/2.95x0.98x0.04in Package Includes: 1x Ruler note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.