Multifunction detection device ST131 PIRANHA-II is intended for detection and localization of special technical means (STM) used for surreptitious obtaining of information, as well as identification of natural and artificial sources of information leakage.

FULL RANGE MODE This mode is intended in general case for visual estimation of the occupancy level of the selected channel and making decision related to transfer MODE "BAND" This mode is intended for detailed analysis of the signals within selected band. DEMODULATION MODE This mode is intended mainly for audio control of the demodulated signal. “SCALE” SUB-MODE This sub-mode is intended for representation of signal in the form of multi-segment scale with numerical values of the signal level.