09-17-2013, 05:39 PM
Eric, if no attachments for leads, perhaps it a "socket saver" that was often used in tube testers to save their sockets from continued use and wear. What the hay do I know? I do know that the test sockets were at least made by Pomona Electronics and may still supply them and are in business.
Jerry
Jerry
A friend in need is a pest! Bill Slee ca 1970.