This compact and robust handheld pen is incredibly user-friendly and convenient, measuring nutrient solution conductivity in the units of your choice and temperature in either °C or °F. Temperature compensation is automated for more accurate readings each time, and the floatable design ensures worry-free use. Plus, the hold function and calibration check mark make it easier than ever to get accurate readings. With a long-lasting battery and auto shut-down feature, the Bluelab Conductivity Pen is the perfect choice for any gardener looking for reliable, convenient readings.