The Voltage Performance Monitor (VPM) from Ideal Industries Inc., Sycamore, IL, identifies voltage events and harmonics that cause IT equipment damage or failures. The VPM plugs directly into a circuit at the point of equipment connection and logs only those events that exceed designed tolerances, including voltage sags, swells, impulses, and excessive THD, determining if equipment failure is related to a specific voltage event. An OLCD screen displays time and severity of events. Up to 512 events can be stored in the VPM's internal memory for review by category or chronological order. The device comes preloaded with tolerance settings based on 15 internationally recognized standards.