Thanks for the opportunity to bid. I provide effective, on-time writing, editing and marketing services for business clients. I've written many technical articles, and I guarantee exceptional results. I'm already familiar with the differences between diaphragm pumps and peristaltic pumps.
For $30 I offer 750 words of well-researched, flawlessly-written SEO unique content describing and comparing diaphragm and peristaltic pumps, with each word chosen to inform, engage and entertain readers.
(Although your requested article length is 400 words, the minimum bid amount here is $30, so I would be happy to account the remaining 350 words toward another writing project of your choosing.)
Please see the generic sample content accompanying my private message. I'm certain I can meet your specific requirements.
Thanks again for the opportunity to bid on this project!
Ed