Student or Learner
Can you help me to express the following sentence more naturally in English?( I am talking about my own invention- correcting ball-point pen)
This tool is really easy to use. Once you have finished writing in English, just place this tool on your sentences and scan it. Whenver there are some mistakes, this bll point pen will correc them by showing apporpiate expression throught the small screen attached on the pen.
Do you mean Wherever there is a mistake?
(the pen will scan each word and note if there is an error?)