Thanks, JB.
Dee here is some information. John Hogan bought his off the E-Bay site. This is different that what you are looking at, members will address your direct questionon this. I just opted to go with voltage spike protection with my devices. I use other meters to check and monitor campground power.
Surge Protection, Panel guard;
http://i112.photobucket.com/albums/n...1/042a55c9.jpg
http://i112.photobucket.com/albums/n...inglock007.jpg
http://i112.photobucket.com/albums/n...tection001.jpg