Specification Brand : bluelab ExternallyAssignedProductIdentifier1 : 0715706332163 ExternallyAssignedProductIdentifier2 : 715706332163 ItemName : Bluelab Combo Meter ItemTypeKeyword : science-lab-ph-meters Manufacturer : Bluelab ProductDescription : Simply place the pH Probe and the Conductivity/Temperature Probe into the solution and the selected reading is displayed on screen. It has a large easy to read display. Use anytime and anywhere the Bluelab Combo Meter is lightweight and portable and does not require a power supply to operate. The Bluelab Combo Meter Measures pH, conductivity / nutrient (EC, CF, ppm 500 and ppm 700) and temperature (°C, °F) 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. Other Features include: Replaceable double junction pH probe Over range and under range indicators Auto off function Low battery indicator 2 x AAA alkaline batteries included UnitCount : 1