Analyze your samples on-site with these portable meters. All feature automatic temperature compensation and built-in cell cup. Cup contains self-maintaining electrodes that never need replatinizing. Optional conductivity range extender (sold below) expands range by a factor of 10. Minimum sample volume is 25 ml. Maintenance-free built-in electrodes-no replatinizing required measures TDS from 0 to 5000 ppm automatic temperature compensation.