Marses Instrument . ... Currently we use a Tem-fast 48 sounding instrument that is based on time domain electromagnetic sounding technology. ... Areas of application are following: . ... hidrogeological research, . ... Despite many competitors' instruments with similar areas of application, Tem-fast 48 has reasonable advantages among small depth sounding devices. ... The Tem-fast 48 sounding instrument consists of following devices: . ... The block diagram of the sounding instrument is outlined below. ...