I bought these for my vet techs in my veterinary clinic for getting heart rates on patients. They're super lightweight, easy to learn on, and provide good clarity with auscultation. They're not as good as the Littmann Cardio III or Master Cardiology, so I wouldn't necessarily recommend these for doctors that depend on auscultation. For support staff that are running around like crazy and just need to get vitals, these are perfect.