A little knowledge (or insufficient bandwidth) is a dangerous thing.
That's my observation with modern DMM meters, they always display a measurement number, but if one doesn't understand things like ranges, modes, test lead usage, true RMS Vs average AC, etc, etc a little knowledge can lead to large measurement errors or even damage. I recall a electrician at work having a DMM literally explode in his hands because he was trying to read a voltage but had the meter leads in the current position. Another tried to read 2.4kvac on a standard DMM, it kind of exploded also. It came down to poor training, as a instrument is only as smart as the person using it.