What are the most accurate ways to calibrate ct clamp values?

[orange-assistant (wisecracker)]

@ljmerza

I used a lamp with a kasa smart switch with energy monitoring to calibrate but it didnt seem very accurate.

Did you use a heat bulb aka incandescent ? Only that one has a power factor of exactly

@orange-assistant

In case you want to actually know your (AC, PF<1) power or energy consumption a ct clamp will not be sufficient as it will only output current