Apart from conductivity, the user is able to measure: resistivity; total dissolved solids; salinity and temperature. These modes may all be accessed without the need to change cell or calibration and are all temperature compensated. One of the most common application areas of conductivity mesurement is concentration control. The RE388TX may be calibrated in concentration units and a sample concentration then read directly from the display. Six conductivity ranges are possible and are selected automatically. Readings may be displayed in S/cm or S/m. Bi-directional RS232 interface allows direct printing of results or full external computer control.