Jim, here are three electronic Stethoscopes, they are all a little different than each other, and by Automotive Specialty. Look down the link list to find them.
http://www.google.com/products?hl=en&client=firefox-a&channel=s&rls=org.mozilla:en-USfficial&hs=MAm&resnum=0&q=electronic+stethoscope&u m=1&ie=UTF-8&checkout=1&sa=X&oi=product_result&resnum=1&ct=ch eckout-restrict