Commercial Trades Institute TC-20 Vintage Vacuum Tube Tester FOR PARTS OR REPAIR

Description

Commercial Trades Institute TC-20 Vintage Vacuum Tube Tester with Charts.
Condition is "For parts or not working".
Cosmetically it looks to be in great shape.
Powers on. Power button is very stiff turning on, just a light hum in the background when it's on. I plugged in a vacuum tube from one of my radios and it does a short test and load test. Yet, this device is missing screws. The type dial seems to skip past the numbers listed. So overall I am selling as is, for parts not working. I just don't know enough to prove every inch of it functions as intended.
Vacuum tube not included.
Shipped with USPS Priority Mail.