Extech EC500 Waterproof ExStik II pH/Conductivity Meter

Measures five parameter including conductivity, TDS, salinity, pH and temperature using one electrode Nine units of measure: pH, S/cm, MS/cm, ppm, ppt, mg/L, g/L, C, F Analogue bar graph indicates trends Memory stores up to 25 labelled readings Adjustable conductivity to TDS ratio from 0.4 to 1.0, 0.5 fixed salinity ratio