This is a nice Sencore model MU-150 mutual conductance tube tester. This was one of only two true mutual conductance tube testers Sencore made. This one is in 100% working condition - all controls and functions appear to work as they should. I calibrated it about 6 months ago - calibration is a bit time consuming and requires the use of a scope. Cosmetically, there is some surface rust on the outside of the case. The panel and controls, as well as the internal circuitry are in very nice condition. Includes the operating manual, tube chart, and a couple of homemade test jigs I made used for calibration - calibration instructions are included. Since this tester is in excess of 40 years old, it is being sold \"AS IS\". The tester will be shipped via FedEx Groundfor actualshipping costs whichI\'d estimate to run between $20 - $60 in the ConUS depending on the buyers location. Thanks for looking!