The SATIC Line EMI Meter is an invaluable tool for detecting and monitoring electrical interference, commonly referred to as "dirty electricity," on power lines. With its user-friendly design, all you need to do is simply plug the device into a wall outlet and you're good to go. No batteries required! The meter impressively showcases the level of line noise in millivolts (mV), displaying a range from 0 to 2999 mV. Not only does it record and display the highest mV reading, but it also provides real-time updates on the current mV numbers. To enhance the user experience further, the meter features a sleek LCD display, which presents a swoosh-shaped line diagram. This innovative diagram effectively illustrates the peak interference both before and after filtering, granting users a complete visual representation of the affected voltage. Not stopping there, the meter even boasts a built-in speaker that emits an audio signal, enabling users to audibly identify the momentary line interference as it occurs. With its impressive functionality and intuitive design, the SATIC Line EMI Meter is truly a must-have device for anyone seeking to maintain and preserve the quality of their electrical power.