What kind of electric field, magnetic field, or electromagnetic wave are you talking about? How and why were they measured? If you are talking about electromagnetic interference (also called radio frequency interference, or RFI), there are plenty of tools, starting with the old fashioned transmitter hunt. Carry a receiver tuned to the interfering frequency, with a directional antenna. Use it to hunt down the sources. Is it entering the house via the power lines, phone lines, TV antenna or cable lines? Directly from a nearby antenna? Cable TV and masthead TV amplifiers are a common interference source. Your cheapest and friendliest help is likely to come from local ham radio operators, see arrl.org.

We don't make other machines with it, because we don't understand it.

different chemicals and sometimes metallic shavings produce the different colors
the following is listed in this order:Oxidizers-Fuel-The special effect or color that is created

Potassium nitrate-Aluminum-Red flame: strontium nitrate, strontium carbonate

Potassium chlorate-Magnesium-Green flame: barium nitrate, barium chlorate

Potassium perchlorate-Titanium-Blue flame: copper carbonate, copper sulfate, copper oxide

Ammonium perchlorate-Charcoal-Yellow flame: sodium oxalate, cryolite (Na3AIF6)

Barium nitrate-Sulfur-White flame: magnesium, aluminum

Barium chlorate-Antimony sulfide-Gold sparks: iron filings, charcoal

Strontium nitrate-Dextrin-White sparks: aluminum, magnesium, aluminum-magnesium alloy, titanium

(fuel..no oxidizer) Red gum-Whistle effect: potassium benzoate or sodium salicylate

(fuel..no oxidizer)Polyvinyl chloride -White smoke: mixture of potassium nitrate and sulfur

(effect..no fuel or oxidizer)Colored smoke: mixture of potassium chlorate, sulfur, and organic dye

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