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Ramsey STE-3000 Shielded Test Enclosure

Smart Meter in a Faraday cage used to isolate RF signals.

From Wikipedia: A Faraday cage or Faraday shield is an enclosure used to block electromagnetic fields. A Faraday shield may be formed by a continuous covering of conductive material, or in the case of a Faraday cage, by a mesh of such materials. Faraday cages are named after scientist Michael Faraday, who invented them in 1836.