The Extech EC400 ExStik features six measurement units, an internal memory that stores up to 15 labeled readings for easy retrieval, an adjustable conductivity-to-TDS ratio factor ranging from 0.4 to 1.0, and self-calibration upon power-up. The EC400 incorporates microprocessor chip technology and patented sensor technology to enable simultaneous measurement of conductivity, TDS, salinity, and temperature. At the push of a button, the EC400 offers the flexibility of interchangeable cell constants, making testing quick, accurate, and repeatable. Complete with the meter and conductivity cell, protective cap, sample cup, four CR2032 batteries, and a 48-inch (1.2 m) carrying strap.