Speaking, I'd personally say 'a thousandth' or 'a tenth of a per cent'. Making use of 'a' instead of 'one particular' in saying it seems nicer. Even further, in exposition, 'a' is definitely an indefinite write-up, which suggests the speaker would not know the id of your noun, in this https://marcogfzsj.blogscribble.com/36707287/the-bulk-thca-flower-diaries