A while back there was a discussion about the differences between clamp meters.
Since I have a Fluke 337 and a craftsman professional "true rms" meter, I decided to do a comparison.
Here's a vid showing the differences:
Bottom line: you get what you pay for.
Note the HUGE difference in peak hold numbers at the end.
Fluke: 102x43.9= 4477 watts
Craftsman: 102x61.6= 6283 watts
Massive difference. As much as I'd like to believe the craftsmans numbers, I know they aren't right.