Portable Fluoride Analyzer NPFA-100 is designed with an auto-read function and is suitable for outdoor applications. In addition to a backlit LCD display, automatic electrode diagnosis, 2 to 5 calibration points, and automatic temperature compensation, this device also has a calibration-due alarm system. The unit has USB interface for data processing and transfer and setup menu to set up number of calibration points, stability criteria, temperature unit, date and time etc.