But do anti-spy devices work, and do you need one ... I bought one of the most popular options I could find, which is a , RF detector scanner, and magnetic field scanner for under $50.

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8m/50° (25ft/50°) Three double beams in a single detection layer Exceptionally high reliability and false alarm immunity RF protection up to 1000 MHz Fast and easy installation ...

Spy 1 is the world's smallest detector offering inconspicuous protection for corridors and passageways as well as control of CCTV, access control and similar systems. It can be flush-mounted in a wall ...