Saw this "CDC Field Tester" while looking thru the vintage section on ebay. Anyone know what it is / think they can use it? (note: I'm not the seller, nor do I know them). http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5210163831&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1