I need to get one of these things but don't know the name for it.
When you're taking amperage measurements at mains voltages using a clamp or fork meter, you need to separate the line from neutral or you'll get zilch. What's the name of those gadgets you can get that plug into the mains socket that separate the line and neutral for a few centimetres for your probe to go around then terminate with socket you can plug the appliance you want to measure into?