Paths of Same Stroke Width Parameter are Different Sizes + Anchor Points Question

Hello all,

I am new to Illustrator (just downloaded today) and ran through a few tutorials on creating paths. I am sure there are still misconceptions I have.

My issue is this: I am seeking to use .svg symbols to create a circuit schematic. The stroke widths on the .svg file paths say that they are 0.264 mm thick, and I have separately used the line tool to make a path external to the symbol that is also 0.264 mm thick. However, they are clearly different thicknesses when viewed on my screen. It also doesn't seem to be possible to access the symbol's anchor points when I use the line tool.

It seems also that these .svg files are composed of paths that are not lines. They're showing up with green rectangular outlines when I select them, whereas the paths created by the line tool are indicated with linear blue. I don't know if this is relevant to the question.

I am attaching images of the discrepancy, and the file can be downloaded here: https://illustrator.adobe.com/id/urn:aaid:sc:VA6C2:1d452423-3ef4-43d3-92d7-e6434ce6f921.  I understand this might be a basic issue, but either through a lack of knowledge as to the correct terminology to use, or the vastness of Illustrator's forums, I have been unable to find an answer over the past few hours. Any help here would be appreciated. Thank you!

In summary, two questions:

• Why do these two paths show different widths, and how can I make them the same width?
• How can I access a .svg symbol's anchor points?

Thank you again!