Combination flat surface pH electrode with auto ranging high accuracy Conductivity cellFeatures:Kit includes: EC500 meter, 3 calibration standards, 3 pH buffer pouches plus rinse solution, 3 cups, batteries and carrying caseMeasures 5 parameters including Conductivity, TDS, Salinity, pH, and Temperature using one electrode9 units of measure: pH, µS/cm, mS/cm, ppm, ppt, mg/L, g/L, °C, °FAnalog barograph indicates trendsMemory stores up to 25 labeled readingsAdjustable Conductivity to TDS ratio from 0.4 to 1.0; 0.5 fixed Salinity ratioRENEW feature alerts user when electrode needs replacement