Induction meter, finding standard reading
You are missing the meter rating of Kh

Kh is given in units of watt-hours per revolution.


e.g. 7.2 Wh/rev or ~26 kW-s/rev 


then divide 7.2 by fraction of hour/rev
-or  divide 26 kW-s/rev by seconds per rev
this gives true power in kW for an Induction meter based on calibrated eddy current Induction motor torque