Supereyes N012 Digital 500mm Tube Manual Focus Endoscope Borescope w/LED Monitor Battery Exclusive MANUAL FOCUS borescope. Tube diameter: 9 mm. Tube length: 500 mm. Big 3.5 monitor for instant view. It has built-in adjustable LED lights on camera head to illuminate the inspection area. The flexible camera is waterproof (6 hours submerged in 27 water); you can inspect objects under water, gaps and holes.