Meter Accuracy

I am familiar that the channel meters in Cubase (i have the 10.5 Artist) are PPM. I knew PPM (if not Quasi) could “grab” the velocity of every sample.
So i magnified one waveform to the sample level and boosted 10 or so samples (couldn’t affect only one for some reason). The meter didn’t bother clipping.
So the question is this:
What’s the accuracy (in samples/speed) of the Cubase default meters ?
Is there something i hadn’t considered ?

Thanks !