How can I view my Android Phone on a PC>

[AC Question]

I often want to see things where my head doesn't fit. It would be nice to start the camera on my phone and have the screen image show on my PC or tablet. Then I can "snake" my phone in some awkward places and see what is there.
I was sure I did that a few months ago but now I can't remember how I did it. I have spent hours installing apps that "sound" like they will work but never do.

Any ideas?

Thanks
Pete