Which brand of medical stethoscope is good?

It is better to have a littmann stethoscope from 3M Company. I don't think so! Another famous brand of stethoscope Welch Arlene? Tycos Harvey Elite was also founded by cardiologist Dr. W. Proctor Harvey, and it also owns brands such as Sprague-Rappaport, ADC and DRG. Europe doesn't know many European brands, but Philips has one or two. Europeans' basic skills and cultural accumulation in acoustics should not be bad, and there is Ling Qian in Japan. As for some people, I personally use German Rhett, which is similar to Madifen made in China, but different from littmann.