LEMI-420 digital 7-component MTS (three magnetic + four electric channels) is intended for the measurement of natural magnetic and electric field components and their variations in laboratory and field conditions. Its major advantages are very low temporal drift and high accuracy of measurements, what makes it especially efficient for deep sounding application. The magnetometer is produced on the base of flux-gate sensor, all three components of which are implemented in the same housing. The electrometer has four channels with high input resistance, which can operate with any type of measuring electrodes. The electronic unit allows acquisition, processing and storage of data about magnetic and electric fields variations on the SD card and their transmission to the computer via USB interface. Built-in GPS receiver provides satellite synchronization of the internal clock and the coordinates of the MTS location. MTS operation algorithm allows organizing both autonomous and synchronous operation of a set of the MTS installed at the studied area. We are flexible to adopt every parameter to your needs.