I recommend this $60 anti-spy camera finder to anyone traveling (get 38% off for Black Friday)
Briefly

The K18 Hidden Camera Detector claims to identify a range of surveillance devices, but its effectiveness depends significantly on user expertise and the inherent limitations of such gadgets.
While the gadget uses LED lights and a lens to reveal hidden cameras, the detection process still requires keen observation and understanding of its operational limitations.
Read at ZDNET
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