If you are a plumber or HVAC technician or any other professional, you need to inspect pipes, ducts or other places hard to get to in order to find problem areas.  Most of the time, you need to make a recording of pre and post repair inspection to have a proof of damage, as well you good work.  Visual inspection cameras are ideal tools for this kind of a job.

General Tools is the manufacturer  of affordable tools and testers for Electrical, HVAC, Plumbing, and Industrial fields.