[sugarwood]

I did some reading and the massive price differences are due to CAT voltage ratings.

The basic $43 Fluke (or $16 Craftsman) is for CAT III or 600V.

The $400 Fluke is rated CAT IV which is industrial level stuff like transformers and junction boxes.

Since this is a car forum, this is small peanuts, and the $16 Craftsman is all you'll need
unless you're planning on climbing power lines or something.

The guy testing an automotive power window with a $400 Fluke
seems like the guy using a 1000 ft.lbs. Ingersoll air impact wrench to assemble a desk from Ikea.
Or a guy playing Smoke on the Water with a $10,000 guitar and amp setup.
Or the guy in PCA DE Green group with his GT3 Cup Car

People with very expensive "best" equipment
who barely are scratching the surface of its capabilities,
or worse, don't even know what it can do,
always look foolish.