Extech EC510 Waterproof ExStik II pH/ Conductivity Meter
EC500 ExStik II meter measures pH as well as conductivity, total dissolved solids ( TDS) , salinity, and temperature. With the EC500s dynamic cell-constant technology it is possible to measure a wide range of conductivity, TDS, and salinity with the same electrode.
The ExStik uses four CR2032 Lit