This instrument has an analog needle that responds to electronic noise fields. You can get the same results with an old AM radio, except you won't see the required traffic or a flashing red light will come on to let you know there's electrical interference in the area. I tried using this device to see if I could hear the transmission from my new smart meter that the utility company had installed while I was away. To my disappointment, the only thing he could hear was the hiss of electricity, which could be heard all along a power cable that carries power to the device. If you're looking for something high-tech, this isn't the device. Save money. The ones you are looking for are $200 and up. PROS: - small - not expensive - flashes a red light that lights up when you pick up electrical interference along a wire with a load - has a speaker that emits a buzz to let you know you're actively drawing AC power - has a high and low setting (probably a resistor inside) Cons: - analog meter, no digital display. Reminds me of a kid's toy from the 70's - just hear the sound along the power line with the painting on it - except for the flashing red light and moving the needle, you get the same results by holding the AM radio in your hand and move it around. under load on the power line - you should not send it back
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