I recommend this $50 anti-spy camera finder to anyone traveling
Briefly

The anti-spy gadget I tested effectively detected camera lenses, leveraging red LEDs to highlight their presence at a distance, but requires direct viewing.
Concerns about privacy due to affordable surveillance technology have led to a surge in advertising anti-spy devices, prompting curiosity about their effectiveness.
Many anti-spy devices on the market are essentially rebranded versions of the same product, leading to confusion regarding their actual effectiveness.
The camera finder requires active involvement from the user, as it highlights lenses with red dots that need to be visually confirmed.
Read at ZDNET
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