The Teslong NTG100P USB Pistol Barrel Borescope will help you inspect the inside of your pistol barrel. This is a great tool to evaluate cleanliness, throat erosion, tool marks, rifling wear, chamber damage, and fouling. SAVE TIME AND MONEY - With an innovative close-focusing camera, assess your cleaning regimen or diagnose firearm problems to save time and money! INNOVATIVE CLOSE-FOCUSING CAMERA SIDE-VIEW MIRROR With an adjustable, detachable, 90Adeg side-view mirror, you can check the barrel wall, or remove it to check the firing pin. 6 LED RING LIGHTS Adjustable for brightness to give the camera a perfect view of the darkest inspection areas. SHORTER FOR PIS Mfg: Teslong