Measures pH and Ion with up to 0.001 Resolution. :: Cal-Due Alarm Prevents Out-dated Calibrations, while Set-Point Alarms warns when readings are outside set-point limits. :: Higher accuracy under varying temperature with Automatic/ Manual Temperature Compensation. :: Mega-memory space that stores/ recalls up to 500 Data Sets with temperature readings, with time and date-stamping formatted to meet GLP standards. :: Wireless and cable-free data transfer with infrared IrDA technology. Comes with PC-based Complimentary Data Acquisition Software for hassle-free data import and report-generation into any popular spreadsheet programs of your choice. :: Recall Electrode Slope, Electrode Offset Value and Previous Calibration Values for easy reference :: Large, Easy-to-Read Custom Display with simultaneous readings provides optimum viewing with user-friendly icons :: Hold Function momentarily freezes reading for easy viewing and recording :: Self-Diagnostic with message codes for easy troubleshooting :: Volatile Memory holds settings and stored data even when you run out of batteries. :: Rugged and waterproof to IP67 standard with protective rubber boot and handy velcro strap for better grip. :: Power with batteries or optional AC adapter for use in the field or at bench-top with built-in stand. :: Energy-saving with Auto-power off feature.