Artisan Archive

Just a quick question. Does anyone know at what level you can further increase your surveying range through the use of attachments? I have 2 attachments that give me 112 surveying and have taken the surveying food to give a total of 120 but I am still unable to survey any further. The tool definitely has the capacity to do so, it has a maximum range of 380 but at the moment I can't set it beyond 320. Forgive me if this is answered elsewhere in this forum, I had a brief look through the FAQs and could not spot anything.