Anyone use a borescope for cylinder inspection?

It has an attachment that screws to the top of the handle to hold the phone and included is a short cord to connect the two. For me, it is easier to operate with a long cord and the phone placed on a stationary object where it can be easily viewed while moving the probe around. I can't speak to the quality as far as durability or longevity as I have only used it a short time. I would say the picture clarity is at least as good if not better than my snap-on BK 5500W which has served me well for many years.