Scanning parks and beaches with one of these can be a unique and fascinating hobby.

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Tim Heffernan Tim Heffernan covers air and water filtration, as well as ...

Why would you want to detect metal? Oh, I don't know … maybe you want to find some gold in the ground. You could dig up ALL the dirt, or you could find the location that has the gold before you dig.

If you're like most people, you have a hobby that keeps you busy whenever you have downtime. Whether that's collecting highly valuable retro video games or going hiking with your favorite tech gadgets ...