I needed a borescope with a bigger screen.  I found one on Amazon for less than $20 that plugs into my mobile phone or tablet using USB-C.  It uses a free app.  One big benefit is “dual lens” layout that provides “straight on” and side views with bright LED’s for both lenses.  Seeing the image on my 11” iPad is perfect! You can also take photos or video using the app. The only ‘downside’ is 16-ft semi-rigid fiber-optic cord.  It coils up nicely, but it’s still there if you need it.  See image.