This Adafruit breakout board measures voltage and current with 12bit resolution.
AFAIK, the INA219 chip used also calculates power.
I don't know if that is implemented in the Adafruit library...
Leo..
P.S. That youtube video is BS.
The are comparing apples with oranges. Copper wire with aluminium wire.
If they had compared the expensive oxygen free copper wire with standard copper wire of the same thickness, the results would have been the same.