I bought one recently from Amazon and it was useless. Done a Google search and they;re mostly for the USA market and unavailable here. Can anyone recommend a multi-use stud/ac/,metal finder. I know the studs are supposed to be either 400mm or 600 the norm but the house I live in (Jack lived there previously) some studs are 700, one wall seems only to have one in the entire wall and the pb is coming apart. help is appreciated.