Just like any other invention of several years ago, metal detectors were primarily designed with the use of crude materials which were not as advanced as the ones that are available today. However, both ancient and modern metal detection devices follow the same principles when you deal with operation - and that is the use of electromagnetic signals to detect metal objects or metal traces in solid objects.

Due to the increasing threats to safety, several establishments both private and public, have metal detection devices installed at strategic location inside their buildings - usually at the entrance. The are two kinds of metal detectors - one is where you have to walk through two pillars of some sort, while the other one is a hand held device that most security personnel carry with them and scan your body with it while you stand.

If your establishment is not that huge, you might as well choose a handheld metal detector to maximize the space you have. To help you with that, here are the types of hand held metal detection devices that might help you decide which one you should buy.

Commercial or Industrial - metal detection devices used for commercial purposes are the ones mostly used in correctional establishments and don't have all of the special features that other hand held metal detection devices have. Security posts at public places such as the airport and hospitals often use this kind of detector. Sensitivity is the primary use of hand held metal detection devices.

Professional - a professional metal detector is tremendously powerful that it can find treasures that are up to 100 feet deep. This type of detectors is usually used by archeologists and treasure hunters - standard metal detection devices cannot penetrate as deep as a professional metal detection device can.

All Purpose - there are also metal detection devices that serve a rather general purpose. This type of device is normally used when searching for coins, rings, jewelry, keys, etc. This type of detector is ideal for use around the house or in the backyard when you need to look for some lost items and trinkets. An all purpose metal detection device are generally the ones sold at a most reasonable price.

Now that you know the various types of metal detectors, you can check for any models of these and find one to suit your specific needs. You simply have to go online and find a reliable site. You won't have to be anywhere else.