Everybody has seen a walk through metal detector if they have had to go to a court or taken a flight on an airplane. These are commonly referred to as security metal detectors. Their purpose is to screen people for any metal object in a security zone. This does not mean they are looking for your car keys, nail clippers or money clips. They are looking for weapons such as a gun or a knife.

Security metal detectors use a very low frequency or VLF technology to detect metal. There are even more advanced metal detectors that do use low radiation x-rays for screening. Metal detectors are used in a variety of places such as airports, prisons, courthouses, government buildings and even schools. Some are used in public places, special events and conferences.

There are basically two different types of metal detectors. One is a walk through or drive through and the other is handheld metal detectors. Many security and law enforcement professionals use a handheld super scanner. The super scanner is used to detect pistols, knives and razor blades. It has a reduction switch that minimizes interference from other non-dangerous metal items.

There is also a tactical handheld detector that is little more advanced and needs no adjustments. This will detect stainless steel ferrous and nonferrous weapons. This tactical handheld metal detector is also waterproof, has a slip free handle and is made of high impact plastic.

You will usually see a handheld detector used after somebody has gone through a walk-through metal detector and the alarm has gone off. They can also be used to check baggage and fabric for both magnetic and non-magnetic items. With a long battery life, they are reliable as well as sensitive.

Walk-through and drive through security metal detectors are both based on different technologies than hand-held detectors. These detectors use digital technology that enhances the targeted action coverage. These are widely used in airports for both passengers and cargo inspection. Because of the microprocessor-based technology, these detectors can eliminate electrical interference with x-ray devices automatically.

Walk-through metal detectors come in two types, multi-zone and single zone. Multi-zone walk through metal detectors are usually seen in a high-security area because they are sensitive devices that can detect conventional weapons such as pistols and knives. The single zone detectors are usually found in places such as schools and public events. Their sensitivity is more in the mid range and used in places such as cruise ships. These also utilize waterproof electronics that protect against humidity and water spray.

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A Little Security History

The term “watchman” has been commonly applied to the function of a security guard since the Middle Ages. This term was carried over to North America where it was interchangeable with night watchman until both terms were replaced with the modern security-based titles as Sacramento CA armed security guards. At one time, vigils were soldiers assigned to guard the city of Rome, often credited as the origin of both security personnel and police, although their principal duty was as a fire brigade. Walled cities of ancient times also had watchmen who even had a special chair called the watchman’s chair. This unupholstered wooden chair had a forward slanting seat to prevent the watchman from dozing off during his watch.

Tools of the Trade

Tumbler and wafer pick sets, torsion wrench, half diamond pick, hook pick, rake picks, Slagel picks, warded picks, and pick guns are just some of the tools a locksmith utilizes. Lock picking is the skill of unlocking a lock by analyzing and manipulating the components of the lock without the key. Although lock picking and lock picks are associated with criminal activity, it is an essential skill for a locksmith. Lock picking is the ideal way to open a lock without the key, while not damaging the lock. It allows the lock to be rekeyed for later use, which is especially important with antique locks that would be impossible to replace if the lock is damaged.

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