When you're ready to publish or solicit an agent, you never want to let your manuscript go without a final polish. At this point, you're so familiar with the work that you know what it is supposed to say everywhere. In fact, you've darn near memorized it, but I haven't. My fresh eyes will notice the little grammatical errors, typos, misspellings, and punctuation mishaps your familiarized eyes could jump right over. As a human being, I also have the ability to recognize style choices and word usage problems that grammar and spell checkers will miss or attack with squiggles. You have the option to provide a previous draft with editing marks that I will compare to the current copy for mishandled or missed corrections. This is also a service where you can provide a style sheet or a specific style guide you want me to reference. 

When I proofread your manuscript, I will watch for:
-typos
-misspellings
-grammar errors
-punctuation errors
-consistency
-repetition

Proofreading starts at $0.005/word. 

I make all changes using Word's Track Changes tool, and all suggestions are entered using the Comments tool. If you have never used these before, I can provide a document explaining them.