Rigid safety requirements require up-to-date technical development in this area. Thus, in particular. Multizone metal detectors of the second generation-“Meter-300” are installed on the main ways of passenger stream. It has excellent characteristics in high safety environment. Metor-300 uses microprocessor design 8Z8F, which includes new overlapping mulizone system of resistors, combining unique mulizone properties with technology of particular distribution. It provides real detection of metals and makes possible to detect dangerous things as well. Distribution of operation frequency excludes action of electromagnetic interference existing in installation places nowadays. Alone with digital processing of signal it provides excellent noise immunity. All parameters are installed by means of two-forked action which enables copying of parameters from one detector to another.