CON900: Waterproof Conductivity Kit EC Meter CON900 Waterproof Conductivity Kit Meter with Lab-Quality Performance Measures Conductivity, TDS, Salinity, Resistivity and Temperature Lab-Quality Performance Features: Measures Conductivity, TDS, Salinity, Resistivity and Temperature One point Conductivity calibration - automatically recognizes 8 calibration solutions from USA, Europe and China series Automatic Temperature Compensation (non-linear compensation for purified water <10µS/cm to improve measuring accuracy) Memory stores up to 300 readings with series number, measured value and temperature Large blue backlit dual LCD display Auto power off saves battery life with disable function Waterproof housing Complete with polymer Conductivity cell, Conductivity calbration solutions, batteries and hard carrying case