I have a Harbor Freight AMES INSTRUMENTS CM1000A 1000A T-RMS AC/DC Clamp Meter ($90)
that I bought to measure the instantaneous inrush current peak on the heat pump compressor.
My solar power system would not start the compressor, I guessed the inrush was the issue.
Compressor only draws about 11A when running, it's just the starting inrush that was
too much.
The HF meter worked a couple of times, and told me what I wanted to know (133A inrush)
It subsequently stopped making inrush measurements, for some HF reason.
So I asked Fluke what they had that would measure inrush current.
Fluke 381 is the device. ($711 @ zoro.com, w/ discount code).
Fluke reported 129A.
I expect the Fluke will be more reliable than the HF, but for crazy $$$, it better be!