Up to two channels measured and displayed simultaneously without cross channel interference no need to re-calibrate every time you switch from pH to ISE measurement! :: Wide pH and mV measurement range:-2.000 to 20.000 pH and 2000.0 mV :: Additionsubtraction methods are almost foolproof. The pH 6500 prompts you through the method steps, allowing easy entry of volumes and concentrations, and providing you with the sample concentration without tedious paper calculations. DirectIndirect, Known AdditionSubtraction and Analate AdditionSubtraction Ion measurement methods in ppm, %, mgmL and moleL. :: Automatically corrects for temperature effects with separate ATC (Automatic Temperature Compensation) probe in each channel. :: Advanced real-time on screen graphing function provides useful indication for specific measurements such as titration. :: Extensive setup screens enable you to customise meter to your needs, e.g. Isopotential Point, Temperature Units, Ion method, ISE Electrode Type, Alarm Limits and other functions. :: Windows CE-driven, full-color touchscreen provides unmatched ease of use in operations and setups with user-friendly icons, user prompts and context specific help screens.