Here is a vintage CTI Commercial Trades Institute TC-20 Vacuum / Radio Tube Tester up for sale.This tester is in great shape and works just like it supposed to. The only thing that it needs is a new bulb for the short light, (bulb GE-B1A ) and it is missing one button on the E up or down levers. I have had this tester for about 10 years. I used it from time to time and believe I have used every port on the tester. The (original) owner before me used it very little. The cord is in great... shape and the original tube tester papers are included. SUPER GOOD SHAPE and works as good as it looks. If you are in need of a good dependable easy to operate vaccum tube tester then this would be a great choice.Please check out ALL PICS CLOSELY AND JUDGE CONDITION FOR YOURSELF.Shipping is a flat $15.00 to the lower 48 states only others please msg me.If you have any questions or would like any additional pics or info please message me. Thank you for looking and have a nice day!!