Cameras have become a staple of modern life, and nearly everybody has one that lives in their pocket these days, but how can one tell if there are cameras in places they aren’t supposed to be? A surprisingly low-tech device has proven very effective at finding hidden cameras and it works by using red LED lights and a tinted lens to reveal the otherwise hidden glare from the camera lens. 

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Technology has made camera lenses so small they can easily go undetected, and even something the size of pinhole could potentially contain a lens recording one’s every move. Everybody has heard a horror story of finding a camera in a hotel room or Airbnb rental, but few realize it’s just as easy to search for hidden cameras as it is to hide them in the first place.

A fancy-looking spy gadget is inexpensive, but the principle it works on can be reproduced with an empty toilet paper roll, red cellophane, and a flashlight. This trick has actually been used by entomology field researchers to find spiders for quite some time, as spiders’ eyes reflect light back much the same way camera lenses do. This is basically a two-for-one hack because if you discover somebody has been spying on you it will be super easy to then send them a box of spiders.