Basics

Meters transmit small packets for a tiny fraction of each day at low power, and the field falls steeply with distance through a wall.

Paired conductors cancel almost completely, so the field a meter away from normal cable is tiny compared with the field beside an appliance motor.

A small patch on a phone cannot attenuate a field that arrives from every direction, and the products sold this way carry no test data.

The phrase has no engineering definition, the meters sold with it are uncalibrated, and the filters address a problem nobody has quantified.

Consumer EMP boxes are sold with dramatic promises but no published test data, and they do not replace conventional surge protection.

A conductive enclosure excludes electric fields and radio waves well, but does little against static or low-frequency magnetic fields.

Every wirelessly linked mesh node relays traffic on the same medium it serves clients with, so coverage improves while capacity falls.

The higher band carries more data over short clear paths, while the lower band penetrates walls better and reaches further at the same power.

Wider channels grab more spectrum and collide with more neighbors, so in a crowded band a narrower channel often delivers better real throughput.

No oven door is a perfect seal; the mesh screen and choke groove keep leakage far below the regulated limit when the door is undamaged.