While it's not something I'd recommend, these are solid-state devices and can be surprisingly robust.
However, they have been largely supplanted by solid-state devices such as the transistor.
The solid-state device came into its own with the invention of the transistor in 1947.
The tester has all these features and can check solid-state devices in and out of circuit.
These things were solid-state devices, no moving parts.
One of the first solid-state devices was a crystal radio.
It was the first computer to do all of its logic with solid-state devices.
Every solid-state device has a small voltage drop across it.
The transistor, invented in 1947, was the first solid-state device to come into commercial use.
The development of alternating current and solid-state devices has rendered it obsolete.