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A metal detector is an electronic instrument which detects the presence of metal nearby. Metal detectors are useful for finding metal inclusions hidden within objects or metal objects buried underground. They often consist of a handheld unit with a sensor probe which can be swept over the ground or other objects. If the sensor comes near a piece of metal this is indicated by a changing tone in earphones or a needle moving on an indicator. Usually the device gives some indication of distance the closer the metal is the higher the tone in the earphone or the higher the needle goes. Another common type are stationary walk through metal detectors used for security screening at access points in prisons court houses and airports to detect concealed metal weapons on a persons body.   Types Walk Through Metal Detectors Hand Held Metal Detectors Metal Detector Technology Pinpoint Mode and Depth Indicator.

The smoke detector senses the presence of smoke and warns you before the fire starts.commercial and residential security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible or visual alarm from the detector itself. These smoke detectors are mounted on ceilings and sometimes even above the ceiling for specific requirements. There are two main types of smoke detectors: ionization detectors and photoelectric detectors. A smoke alarm uses one or both methods, sometimes plus a heat detector, to warn of a fire. We supply smoke detectors and other fire protection and fighting products based on your requirements.

The smoke detector senses the presence of smoke and warns you before the fire starts.Commercial and residential security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household detectors.

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