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

The prevalence of hidden cameras and listening devices in our environment has raised concerns for privacy, leading people to invest in anti-spy devices to feel secure.
The anti-spy device I tested, a three-in-one camera finder and RF detector, proved effective in picking up camera lenses, demonstrating its ability to help people find hidden surveillance.
Read at ZDNET
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