Attributes . active energy +/- 0.5 % || reactive energy +/- 2 % || active power +/- 0.5 % || apparent power +/- 0.5 % || frequency +/- 0.05 % || power factor +/- 0.5 || current +/- 0.5 % || voltage +/- 0.5 % || apparent energy +/- 0.5 % || reactive power +/- 2 % . Names