For in-center patients, ask which model Fresenius machine is used. Download the manual as a PDF file.
When I have D, I ask the tech to turn the machine so I can see the readouts -- and with the help of both tech answers to my questions and reading the machine manual, I'm learning to be more involved in my treatment.
http://www.fmcna.com/fmcna/OperatorsManuals/operators-manuals.html