Crystal saw
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"What's that?"
"The Library put that in after the Modesto Act of Terror. Keeps track of magic use."
"So you take their handouts, and in exchange you let them spy on you?"
"The gas company keeps a meter behind the garage. Are they spying on me?"
Alice Quinn and Stephanie Quinn[src]

The Magic Monitor is a device that measures the use of magic in an area.


After the destruction of the Modesto Valley College Library, the Order of the Library of the Neitherlands had monitors installed in the homes of Library Card-carrying Magicians and schools to track the use of magic.[1]


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