Testing Fiber with a cheap OTDR from Amazon - for beginners and home users

Do you have a broken piece of fiber that you need to test or confirm where the issue is? Maybe somebody told you to use an OTDR to find the issue. In this quick lesson I will explain how and when they are used, and give a few examples with parts from the lab using a cheap device I got from Amazon.
Examples of ODTRs you might purchase, remember that if you use my links it benefits the channel a little bit:
Handheld Version: amzn.to/3u9RAhK
Tablet Version: amzn.to/42fPxFo

[@neltechnetworks]

Thank you so so much for the wonderful explanation continue making this great videos. Thank you once again.

[@James-xg4jr]

today years old when i learned what a launch cable was

[@PatrickDickey52761]

Out of curiosity, where did you get the launch cables, or did you make them yourself?

[@tciproductions]

There's a ton of them on Amazon, if you use my saved search: www.amazon.com/s?k=fiber+launch+box&crid=IC5XCL5V9NXS&sprefix=fiber+launch%2Caps%2C209&ref=nb_sb_ss_ts-doa-p_1_12
I found I had to test them with a light meter to be sure the results were good, I have gotten a couple of bad ones over the years.