air comp motor went out

The correct name is a Clamp Meter. I was taught by a retired Navy electrician 25 years ago and Lineman's Gauge is what he called it.

Okla been an electrician for 20 years currently work in high voltage switchyards
And that is a clamp on amp meter and is only good for max of 600 volts
A lineman would never use a tool like this other than at home lol