Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. ESD Simulators, also known as ESD Guns are used to test the immunity of a device to electrostatic discharge. These devices are used in special electromagnetic compatibility (EMC) laboratories. These ESD pulses are special high voltage, high frequency pulses that help verify that the device under test is immune to static electricity discharges. ESD simulators are necessary to receive a CE mark, and by most suppliers of components for motor vehicles as part of required electromagnetic compatibility testing.