This stethoscope was negative for Mercury (Hg), Lead (Pb), Arsenic (As) and Cadmium (Cd) when tested with an XRF instrument. This appears to be an older model (or perhaps a toy?) There is no brand or maker’s mark. All components were tested. I am hoping to be able to test more modern stethoscopes in the future, ideally different brands. There are currently three examples on this site.
Thanks to Roxanne LaFonde for donating and supporting this post!