The EC510 is a conductivity testing kit. Kit includes EC500 meter, 3 calibration standards, 3 pH buffer pouches plus rinse solution, 3 cups, batteries and carrying case. Measures 5 parameters including conductivity, TDS, salinity, pH and temperature using one electrode. Analog bargraph indicates trends. Memory stores up to 25 labeled readings. Adjustable Conductivity to TDS ratio from 0.4 to 1.0; 0.5 fixed Salinity ratio.