Introduced in Ghostbusters II, it is explained in the script that the Giga Meter is a gauge designed to measure psychomagnatheric energy in GeV's (Giga electron volts). The prefix Giga, correctly pronounced 'gi-gah' not 'guy-gah' measures 1 billion and electron volts (eV) are a unit of kinetic energy. It is used several times primarily by Egon to examine the site where Dana Barrett's baby carriage stopped, the Manhattan Museum of Art, the abandoned subway tunnel, and lastly the positive energy rallied by New Yokers during the Lady Liberty walk (shot cut very short).

In the real world as props the Giga Meter is made by fans far less than the PKE Meter likely due to it's limited screen time and availability of parts needed. Cyland Props' Giga Meter Page is by far the most comprehensive and informative page to date with information on the prop and is a must read for Giga Meter builders.

The Giga Meter is built out of a Power Scrubber N' Rubber with assorted electronics along with spinning lights inside a plastic dome. The ears on top of the Giga Meters are made out of Realistic Stereo Microphones, and rotate back and forth.

Other Apperances
The Giga Meter has also made appearances in other films and shows such as Teenage Mutant Ninja Turtles. The Giga Meter was used in a Promo Video for the Transportation System in California. The meter is used as a "Gloomsday Device" to rid of all signs promoting the new rail system.

The Giga Meter has also made an appearance in the 1991 film Star Trek VI: The Undiscovered Country ever so briefly in a montage where Starfleet officers scanned every uniform on the ship for traces of Klingon blood. In this scene, the pivoting microphone "Ears" of the meter are missing, but the digital display on the top was still visible as well as the "Scanning Orb" on the bottom of the device.

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- Cyland Props' Giga Meter Page

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