Diy Emf Detector

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.

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.