If you care about computer networking, this is what you need. Starting with a $10 tester that basically just checks that the pins are aligned may seem like a big leap, but it really helped me save time and figure out what's wrong instead of just guessing and drawing conclusions. First, it's well built. I throw it in my tool bag, laptop bag, it falls off with no problem. It is compact and can be taken with you at any time. If you're doing a quick test, just plug it in and it'll light up forβ¦