An Electromagnetic Interference (EMI) meter is a plug‑in diagnostic tool used to measure **dirty electricity** — unwanted electrical noise and high‑frequency voltage spikes traveling along wiring in homes and businesses. These disturbances are a primary source of dirty electricity fields.
Also known as a **Line Noise Meter** or **Micro Surge Meter**, an EMI meter measures electrical pollution directly from the circuit it’s plugged into. It detects high‑frequency voltage transients up to **2000 millivolts**, giving you a clear reading of how much dirty electricity is present.
Recommended levels of dirty electricity are: