Okay, so these types of devices are a luxury. However, they can also be a great tool to help find a missing item of yours. But, if you have dropped a valuable piece of metal inside your house, a metal detector is not going to help a bit. If you think about what goes into a house’s foundation and construction, you should know that this device will be rendered useless inside. After all, there are electrical currents and metal all around your home.
But, if you happen to drop a ring or your house keys outdoors and have a general idea of where then yes this could be a useful tool. However, they are more beneficial to find metal that is underground as you can physically see minerals that are on the surface.