2 wire per switches have load and supply connections only as described usually come with a capacitor which is used depending on loading of lighting circuit being switched
also have a rechargeable battery and are designed to be fitted internally replacing a standard 1 gang switch
Megger all the way fluke ok too T.I.S. look to much like a copy /clone
screen looks cool though
BUT software with all instruments i have found to be lacking or flawed one way or another
Hi all just landed signed up to this interesting forum
with 37 years experience Industrial commercial and domestic (try to avoid apart from Mostly E.I.C.R ) ;-)