Ever seen this tool?
 

It’s a pro-chek hi voltage ignition analyzer.
I bought it in the late 1970’s.
This tool is NONINTRUSIVE.
Just put the supplied headphones on!
I use it frequently for spark plug wires
It detects improper firing.., coil output
Especially regarding 5/7 crossfire on a Chevy.
It is a very simple tool.

Have you seen it before?

If so, where?

I need a new one

you had me at probe ! lol

Is something like this a 21st century version?

https://www.amazon.com/General-Techn...a-450554422311

I honestly don’t know.
If I make the purchase, I will post results.
Thanks for your help.
Funny thing: my tool cost $3.50 in the 70’s