Make a Emf

How To : Make your own EMF detector for under ten dollars

An EMF detector will help you find invisible electromagnetic fields, and you can make an inexpensive one for under ten dollars. This will only detect the presence of a field, you will need other tools to be able to measure its strength.

How To : Make an EMF detector out of an Arduino

An EMF detector lets you pick up on electromagnetic fields, a useful tool if you're into amateur ghosthunting. To make this, you will need some wire, a resistor, and an LED. You will also need an Arduino to use as a controller.

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