A cannula includes a coupling interface adapted to receive and engage a wide variety of medical instruments having engaging portions which are different. The electric current drawing circuit is connected to a semiconductor device under test, and draws a branched electric current branched from a measured electric current output from a second terminal based on predetermined electric voltage. In some embodiments the second set of fiber strands overlaps in opposite diagonal directions while overlaying a first set of generally transverse parallel fiber strands. The processor may be further be configured to move the private screen so that it follows movement of the user. In this manner, the code for converting data to the XML format need not be manually generated. The prisms with facets may be provided at a central portion of the lens member and the facets are configured to refract light toward a light-exit side of the lens member.