Most consumer metal detectors find coin-sized objects 8–16 inches deep, but pro models can find items several feet down. In ...

We spoke with metal detector experts to learn more about how they work and how metal detectors can tell the difference between different types of metal.

We asked visual search scientists, a metal-detecting enthusiast and a detective to share the most effective strategies to find missing objects.

His STM32-based pulse induction metal detector looks good and works well, as you can see in the video below. [Mirko] reports that the device can detect a coin at 30 cm and a large metal object at ...