See in your curriculum you may need a stethoscope for the basic understanding required for measuring BP etc. But at your workplace you will never need one. Your work will be intricate and sophisticated and most of the times you will be working in Operation Theaters. So yeah! you will have a stethoscope to buy but you will not need it to use in your professional career.

To know more about the career of perfusionist visit the link provided below:

https://www.careers360.com/careers/perfusionist

I hope this answer helps. All the very best for your future endeavors!