James’s Relay Tester!
This is a relay tester, and it tests relays and shows you if they are actually working.
I use a lot of low signal relays at work. Sometimes they stop working so I needed a way to check them. So I built a circuit that checks them. It was just a quick circuit on some prototype board that plugs into our test system and with a button it actuated the relay. I thought though… I for sure can do this as a handheld doodad. So I found a clicky button and started this one.