I am a cardiac device tech and have been for 6 years. I don't have any fancy credentials after my name but I know more than most RN's when it comes to devices. I also don't work for a device company or for a hospital I work for a group of EP's. The devices can be checked by simply calling the device company of the particular model (ie. Medtroinc, Boston Scientific, St. Jude, or Biotronik)that the patient has implanted. To learn this skill it takes most a minimum of a year-2 years to feel completely comfortable doing routine checks and troubleshooting on a device. All of my training was on the job, I had taken an EMT-B course so I had some previous medical knowledge.