HFCSMT system has been developed to enhance resolution in CSMT technology. The system covers a frequency band of 1.4kHz-106kHz for transmission, and measurement is performed using 16 frequencies. The transmitter power amplifier operating on a 12V cell is capable of a maximum output of approximately 3A, and the signals can be received at points several 100s of meters away. As for the selection of frequencies, synchronization is ensured for the receiver set no matter what instant the measuring process is commenced, the process being fully automated including the gain control. Phase and amplification values obtained for the electric and magnetic fields are subjected to A/D conversion. The data are stored in the microcomputer memory as apparent resistivity and phase data, and are forwarded to the host computer upon termination of the measuring process. Since both analog processing and digital processing are used, the measurement process is over in approximately 96 seconds. This system is being tested in various fields of technology. 1 fig.