Vascular caliber with operating microscope eyepiecescale of measurement, the length and distribution of blood vessels using a ruler and measurement of sub-regulation.
血管口径用手术显微镜的目镜标尺测量，血管长度和分布范围用直尺和分规测量。
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Focusing eyepiece provides a sharp, easy-to-read scale, which is designed with semi-transparent blue background so you don't have to point the instrument in a certain direction to get your reading.