I have used this every day for over 2 months. It has been as durable and clear as my $250 3M Cardiology III. Looks much better. Ear pieces were not screwed on tightly enough, and fell off in the hospital. I was able to find and remedy the problem with some elbow grease. QC is understandably lower than at 3M, but finding dust under the diaphragm upon ... Read more
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