Portable Power Quality Analyzer are instruments that evaluate how well a power source supplies an electrical load, and how well the load functions using that particular power source.  Electrical devices are subject to premature failure when poorly matched to their power source.

Class S Power Quality Analyzer are used to continuously monitor and analyze electricity lines for disturbance which can disrupt the reliable delivery of energy or cause damage to equipment plugged into the grid. Power quality disturbances include events such as voltage sags and swells, transients, harmonic distortion, and voltage/current imbalance.