teslong borescope for rifle barrel care, gun cleaning visual inspection camera w/45-inch-flexible probe-fits .20 caliber &larger hunting sho

this boroscope has a small focal length of about 0.4 inches, which gives images illuminated by led ring light. with 2 sets of side mirrors: includes 5mm, 6mm, 7mm, 8.5mm, and 10mm diameter mirrors, which are mainly suitable for bars of. 22, 0243,. 30,. 38,. 40, and other calibers includes a 2-in-1 usb & micro-usb plug and a type-c adapter, so you can play, or record, live barrel images on your android smartphone, windows pc , or macbook (osx). please note this usb version does not work with iphone or ipad (ios) the 0.2" diameter probe allows for easy entry into rifle barrels as small as .20 caliber, to inspect for cleanliness, throat erosion, tool marks, rifling wear, chamber damage & fouling. carbon residues accumulate during firing and can impair your accuracy. the boroscope helps you to see deposits in the barrel and grooves of the grooves and is a great support when cleaning the barrel. please avoid bending the flexible probe to a radius smaller than the storage box. bending too tightly can damage the borescope..syi