Polarity Scanner

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A polarity scanner reveals the presence of Invidium

A polarity scanner is a piece of technology carried aboard Starfleet vessels. When scanning, it produces a series of different colored beams, with the purple beam used to identify invidium.

In 2366, Geordi La Forge used a polarity scanner to illuminate Invidium from a Mikulak container. (TNG: "Hollow Pursuits")