Supereyes N013 Waterproof 8mm 1 ~ 100X Digital USB Borescope Endoscope Flexible Snake Camera with 800mm Tube Manual Focus LED&nbsp; Exclusive MANUAL FOCUS borescope. Tube diameter: 8 mm Magnification: 1 ~ 100X (continuous zoom capability). Focal length: 50mm ~ infinity Operating system: Windows XP SP2 or above (including Win 8 32/64bit), Mac OS  10.5 or above, Linux Measurement Function available for Windows system, including arc length, point-point length, angle Tube length: 800mm. Water Proof: IP67