I overlooked claiming a portion for tools bought to do work on IP, phoned ATO re an alteration to previous years return and was told that the tools could be claimed in full regardless of what they were used for afterwards. Lodged an alteration stating was I was told and it was processes without question. Not sure why tools are considered different to other things like laptops - unless because the tools were bought entirely for the purpose of working on IP and not for part IP and part private use.