I'm interested in purchasing one of these devices soon, but before I do, has anybody used this, or a similar product, looks like it could be very usefull for tracing circuits and checking if cables have been run in the correct zones, may even be handy for finding borrowed neutrals?
http://isswww.co.uk/products/alphatek/mi2093.aspx
http://isswww.co.uk/products/alphatek/mi2093.aspx