The Bluelab Combo Meter is a great piece of equipment that will measure your pH, EC and water temperature in real time. General Information Ensuring pH, EC and water temperature are kept within optimal range is essential for vigorous growth throughout all stages of the cycle. If any of these are out of range, you run the risk of damaging your crop. Benefits Lightweight and portable Display is large and easy to read No calibration required for EC and temperature Replaceable pH probe included Auto off function to preserve battery Low batter indicator Measures pH, EC (ppm, 500 and 700) and temperature (°C or °F) How to Use For best results, set up in accordance to the instructions provided. We recommend registering your combo meter online to activate the warranty.