Mercury 202-203 Tube Tester, 1953
Tube Tester, Mercury: Model 202-203 (1953), United States 66 x ,64 x 60cm. Musée des ondes Emile Berliner.
This device was used to test various kinds of tubes, which were a key component in radio receivers. Tube testers such as this would have been set up in pharmacies and shopping centres for public use.
Below is another view of the tube tester, showing the board where tubes could be inserted for testing.