Ideal TL-532A   Alligator Plug Adapter Real-time TRMS voltage, frequency, and harmonics monitoring Selectable thresholds based on the most accepted international standards, defaults to ITIC Measures Percentage THD and logs periods of 3-Percent (line to neutral) Invertible display, when it is necessary to plug in upside down Saves up to 512 events, Cat III 300V,2-year warranty