If it works as advertised, it'd be well worth the money as long as it would still be compatible when your phone is upgraded. I have a Harbor freight cheapie that I picked up on a black Friday sale. It's bulky, but gets the job done.
Famous Last Words: "Watch Me!"
2015 Denim Black RG, FM ss ceramic coated 2-1-2 pipe, White Bros Original E Series Mufflers, FM ac, PV Tuner
i got one of the ones that plug into the phone, on amazon they were $15. works pretty good a little hard to control what its pointed at once you get down into something, used it to look inside the gas tank on a generator, put about 2 ft. into the tank lookin for rust. i upgraded my phone, i have ths samsung s8+ and had to get an adapter from the phones c type connector to the mini usb on the borescope. the mini usb is what my old s5 used.
the one i ordered https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
the adapter i needed https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I got the $20 one too. I'd say that it barely works. I was trying to look at the inside of 2inch pvc pipe looking for cracks. You could a spot about the size of a dime, not the whole pipe. So I could see a very small area along the bottom. Turned out it was cracked, found by a pressure test not the bore scope. I'm sure there are better ones to buy.