This is a great vintage vacuum tube tester found along with other vintage electronics at a local Doctors estate sale . This is a B & K model 707 Dyna-Jet Dynamic Mutual Conductance tester with tube chart , Parts list and a Manual that looks brand new and it is in the original carry case . I plugged it in and it powered up and a couple lights came on but I had no way to test it . This tester is in amazing condition . I would call it as close to mint as possible it looks as though it was not used . Shipping and handling $39.50