Extech Instruments EC510 PH Conductivity Meter

9 units of measures pH, S/cm, MS/cm, ppm, ppt, mg/L, g/L, C, F Analog bar graph indicates trends Memory stores up to 25 labelled readings Renew feature alerts user when electrode needs replacement Adjustable conductivity to TDS ratio from 0.4 to 1.0; 0.5 fixed salinity ratio