Bluelab Conductivity Pen - A robust handheld solution for measuring conductivity and temperature on the go. The Bluelab Conductivity Pen simply tells you the amount of nutrients 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 our Bluelab pH Pen you have a robust, convenient and accurate measurement system. Product Features: Fully waterproof, not just water-resistant Selectable measurement units so you can customise with your preferences Flat electrode for easier cleaning and maintenance Hold reading function to capture every measurement with ease Automatic temperature compensation for accurate readings anywhere Auto-off function to extend battery life 1 x AAA alkaline battery included, getting you started immediately