The Extech EC510 is a conductivity testing kit that includes a EC500 meter, 3 calibration standards, 3 pH buffer pouches plus rinse solution, 3 cups, batteries and carrying case. It measures 5 parameters, including conductivity, TDS, salinity, pH and temperature using one electrode. The analog bargraph indicates trends, while memory stores up to 25 labeled readings. It has an adjustable conductivity to TDS ratio from 0.4 to 1.0; 0.5 fixed Salinity ratio, and is CE certified.