One of the ways to protect against security threats is to use a walk through metal detector which allows the security personnel to detect possible weapons before entry. However, finding a good metal detector is a challenge, as it can be very difficult to choose a detector that fits your needs within your prescribed budget. For example, if you are thinking of a walk through metal detector then there are different types and brands that are available with different sensitivity factors. In general, with these types of detectors, you will be able to create an electromagnetic field that encompasses the body of the person walking through the detector. This electromagnetic field will interact with any metal that may be on their body of the guest and this interaction will create a secondary magnetic field which will be picked up by the same detector. Depending upon the strength of the magnetic field you will hear a bigger beep or a smaller one and that will alert your security personnel to take a closer look at the person. These types of detectors are more expensive;however, they are well suited toward dealing with large numbers of people due to their ease of use.
Of course, if you need to scan the person in more detail by a security personnel then you will need to use a security wand. Basically, this is a type of a device which allows you to pass over the various body parts of a person and this allows you to have a more detailed scan of the person especially if the body detector has emitted a warning while the person was passing through.
You will need to do your due diligence well and you will need to make sure that you buy your metal detectors from a company which has a well known reputation in the field and they should also have good references. Depending upon the severity of the security threat that you are expecting, you may think about working with detector brands that are used in high security risk areas. Of course, sometimes the detectors may also be too sensitive which can cause you to flag down many false positives and thus you will also need to make sure that the company installs them and trains your security personnel on their effective use in order to get the best possible results.