Teslong NTG100P 10in Rigid USB Borescope Black Metallic Silver TSNTG100P. 18 in to 3.94 in (30 mm to 100 mm) Depth of Field of the camera WITH 0.2 in (5 mm) side-view mirror: With lock ring on: 0 in to 0.28 in (0 mm to 7 mm) Without lock ring: 0 in...