Units of measure include "S/cm, mS/cm, ppm, ppt Adjustable Conductivity to TDS ratio factor from 0.4 to 1.0 - conveniently calculates the TDS value Large 3-1/2 digit (2000 count) LCD display Data Hold and low battery indication Auto Power off with disable Adjustable Automatic Temperature Compensation Simultaneous display of Conductivity or TDS plus Temperature Two ranges for Conductivity and TDS with one point calibration per range