I have been using the same junky little non-diaphragmed Littman that came with the first aid kit I got when I finished my EMT-B and it has done the job just perfectly. Tust me--unless you are an EMT-P or an MD and will be needing to differetiate between "rales" and "Wheezes", etc., anything that allows you to palpate BPs and perhaps perform the occasional auscaltation (which will most crtainly then be repeated by RNs, PAs, Med Students, Residents, and Attendings upon your arrival in the ER. Working currently in the ER, I would agree with this ee more addiing that if you have a nice one, you will be lucky to have it around our nek about a wek before someone borrows it and it disappears to some unknown location.