... hard-to-reach and hard-to-see areas ,Optional Extension Cable, Suitable for hard-to-reach inspection10.Conformed with CE ... surverying function3.Flexible tube, Main unit, Hook, Mirror, Magnet4.Extension tube with 1M,2M,3M,5M length for easy extending ... many applications including: HVAC inspection,Vent Pipe,Machine Equipment,Engine,Cable Routing,Automotive / boat / aircraft inspection.One Set Included:1 ...