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.
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.
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