On Saturday, December 8, 2018 at 11:43:27 PM UTC-5, Jeff Liebermann wrote:
On Sat, 8 Dec 2018 13:13:26 -0500, Ralph Mowery
Also, I have a few of these borescope or endoscope cameras in 8mm:
https://www.ebay.com/itm/8mm-WIFI-Endoscope-Borescope-Inspection-camera-Scope-Tube-Waterproof-for-Iphone/192130852197
I use them mostly for looking down holes, tubing, and hard to see
places. The 8mm flavor has 640x480 native resolution, which is much
better than the lower resolution found in the smaller diameters. There
are also version with a "stiff" cable, which I've found quite useful.
However, the apps all suck, the construction marginal, the Hi-Fi and
BT versions are buggy, but for the price, all this can be tolerated.

I've used a few similar borescopes...the resolution of 640x480 is OK for seeing what is there but beyond that, fairly useless. The image distortion bothered me quite a bit as well.
Having said that, do you know of any produce with a higher resolution and better app?