Bluelab EC pen is the ultimate solution for measuring conductivity. The Bluelab® Conductivity Pen simply tells you the amount of nutrient in your solution. Conductivity is automatically compensated with the integrated temperature sensor. Providing a compact, quick and accurate way to measure two key parameters for crop health. Teamed with the Bluelab® pH Pen you have a robust, convenient and accurate measurement system. 0.0 – 10.0 EC or 0 – 100 CF Measures conductivity and temperature Selectable units for conductivity and temperature Shows conductivity scales CF, EC, PPM 500 & PPM 700 at the touch of a button Fully waterproof Backlit LCD display Calibration optional Successful 30 day calibration indicator Hold reading function Low battery indicator Auto off function Automatic temperature compensation AAA replaceable battery included Packaged Weight: 0.134 kg Packaged Length: 205 mm Packaged Width: 55 mm Packaged Height: 32 mm