Dave55, IMO they are very good meters. They are able to tell you a lot about a 120 receptacle. Heck if you know how to use it, they can even tell you the appearant power of a connected load, THD, IGR, GFCI, etc. They are simple to use, only one button.
The down side they will only test a 120 volt receptacle, and cost around $500. There is an availible current probe that expands its capabilities.
It is probable more of a tool for inspectors and engineers. However if you perform a lot of installs, trouble-shooting, can justify the cost, Get-R-Done, you will love it.
