The Extech BR50 is a Video borescope and camera tester with a 17mm camera diameter and 2.4 in. Color TFT LCD Monitor. Can also test installed surveillance cameras for correct target alignment. Applications include: Home inspection: Inspect in walls for mold, insect infestation, electrical wire or water pipe location; HVAC: Inspect inside ducts, behind motors and compressors; Automotive: View inside or around engines and transmissions; Government: Safety and security inspections; Industrial: Inspect weld integrity, process equipment, gears, molding machines; Aerospace: Aircraft inspections for contamination, debris, cracks or other damage.