Running compression test. This would be a test you might do if you have good compression on a static test. It might still be interesting to see what it shows on your low cylinder. This test is rarely done. This video is longer than it needs to be you can stop watching after 10-minutes.
https://www.youtube.com/watch?v=YbR7Ja2E28s&t=766s
You want to see the modern way of doing a running compression test using a pressure transducer. I couldn't cut it out in the real automotive repair world anymore, the technology has left me in the dust in just a decade.
https://www.youtube.com/watch?v=cGM6H5dz7g8