Recommended borescope

I've been using a relatively inexpensive VEVOR (@ $100 -- Chinese-made but most are):

(https://www.vevor.com/pipe-inspection-camera-c_11031/vevor-articulating-borescope-camera-with-light-two-way-articulated-endoscope-inspection-camera-with-6-4mm-tiny-lens-5-ips-1080p-hd-screen-8x-zoom-8-led-light-snake-camera-for-automotive-plumbing-p_010921210736?srsltid=AfmBOoqNhqfT-7ekqtKMeNYo7DWLQ3Iee1DHw4GSkoChtc4oKODC42yU)

It works satisfactorily for viewing engine internals including valves.

This looks great, price-wise. Can you post a couple valve images taken? What engine are you using?

I also use the vevor on my 912uls. Works great.

Yes the Voyager is made by ATS, and there is a sale right now but even on sale it’s 800.00. Here is a link to it, and they have a video showing it used for a valve inspection. Also you can click on the “see specifications” link and see the manual and all that it comes with. It is a lot of money for just occasional use, but it comes with a lot of accessories that make it do almost any inspection job. The camera lead (wand) is super flexible, which is primary difference with lower cost cameras which have a more rigid wand. There is also an accessory rigid holding shaft (tubular sleeve) for when you want to support the wand rigidly over a distance. I’m very happy with it, but for the price, the VEVOR that David posted looks like it gets most jobs done at a fraction of the cost. 

https://www.aircraft-tool.com/detail?id=ATS-VS22