Bluelab Combo Meter The Bluelab Combo Meter is all that is needed for simple and reliable crop management and it's all within arm's reach!The Bluelab Combo Meter is an all-in-one pH, conductivity and temperature meter.The Bluelab pH Probe and the Bluelab Conductivity/Temperature Probe are simply placed into the solution and the selected reading is displayed on screen. As the Bluelab Combo Meter is portable and does not require a power supply to operate, it can be used anytime and anywhere to help you manage your crops daily nutrient requirements.Calibration of the pH is simple with the push buttons on the meter and fresh calibration solutions. Conductivity and temperature do not need to be calibrated as this is locked in during manufacture. Features Measures pH, conductivity/nutrient (EC, CF, ppm 500 and ppm 700) and temperature (°C, °F) Lightweight and portable Large easy to read display Simple push button pH calibration Successful pH calibration indicator No calibration required for conductivity and temperature Replaceable double junction pH probe Over range and under range indicators Low battery indicator 2 x AAA alkaline batteries included (Auto off function)