Here is a Vintage B&K Dynascan Dyna-Jet Model 707 Mutual Conductance Tube Tester Checker. Outside is in rough condition as shown, but it seems to test tubes accurately. No paperwork, but the tube charts are available online. An excellent addition to anyone's collection. Money back guarantee you will not be disappointed.Click the "Enlarge" tab to view all pictures for details. I do not offer Buy-It-Now's and do not end my auctions early. Buyer to pay actual shipping of 19 l...bs