I got the same Teslong borescope on Amazon.ca for about $70 Cdn/ I love it.
I have not worn out any pistol barrels, but I did find one (a 1911) that had a very poorly made barrel.
I have worn out many rifle barrels. They last 1,000 to 7000 rounds, depending on caliber.
A borescope is a great way to monitor. You see things clearly that you cannot see by looking don the barrel with the naked eyes.