This product has a high resolution and accuracy for measurement. With backlit two line,the Dot Matrix LCD display provides clear information about the setup, measurement and calibration. The direct ion measurement uses many Ion selective Electrodes. The multi-Point push button calibration has an Auto- Buffer Recognition for optimum and full accuracy. The product is user friendly with customization and the calibration alarm prompts user defined interval to ensure regular speed. Automatic download of data is allowed. An expanded memory stores data stamped by a built in real clock and recalls up to 100 data sets at regular intervals.