A borescope is an optical tool used to view areas that would otherwise not be visible (pipes, inside walls, and machinery, etc). 

This has a 5.5mm Ultra Thin Probe No wifi or bluetooth connection required. 0.21 inch smaller lens inspect camera probe make it easily access a wide variety of confined place. It is widely used for inspection of industrial machinery, automobile repair, pipeline fixing, household air-conditioning appliance inspection, wall structure inspection, sewer line inspection, and other inaccessible places.A digital endoscope with 4.3"screen, more convenient and easy to operate and observe.

16.5 FT Cable and High-quality Camer: One-button 180° rotating to switch snake camera orientation for better observation. IP67 waterproof and 3 adjustable brightness levels to ensure a clear image even under dark conditions. The camera focal range is 1.96~3.93 in (5 - 10cm). 5M semi-rigid cable can be bent and hold its shape to access a wide variety of narrow places.