My CNC router has an electrical noise issue somewhere, prob multiple places, and it makes my spindle VFD fault out sometimes. The VFD manual for the fault suggests it's a noise issue.

It's so bad that I've used another router with it that didn't even have a VFD (just a Porter Cable plugged into the wall) and it messed that up and it even messes up my keyboard if I move it close. It's probably given me cancer already too.

Do they make a reasonably priced directional electrical noise sniffer so I can pinpoint the places where the noise is coming from? I'm envisioning a wand with a meter on it that you point at things. Think geiger counter. Or Ghostbusters.