QNA 412/QNA 413 is a power quality analyser compliant with international Standard IEC-61000-4-30.It is certified class A device,with a high degree of accuracy, suitable for measurement and enables analysis of the variables related to the quality of supply (voltage, flicker, harmonics, events, etc.). It can be used as a network analyzer and redundant counter as it analyses current signals, power consumed (active and reactive), the power factor and active and reactive energy consumed or generated with an accuracy of 0.2S, like high precision energy meters.