I know that the Tasco Inspector II has been around for a long time, but I have never personally used it. The Inspector III must be their newest offering.
Tasco is the company that makes Greenlee branded circuit tracers and phase rotation testers.
I do own a Tasco circuit tracer that I bought around 1998 that still works, so it must be pretty well made.
It is the same as the older Greenlee model 2007 tracer.
They changed their tracer design a few years ago to an auto ranging type, now known as the Greenlee model 2011, that really blows chunks, IMO.
I looked into the Tasco Circuit Mapper a few years ago when they first came out, but at around $800.00, I didn’t think it was worth it.