Direct ISE and pH readout Simultaneous data/temperature display Stability display Selectable resolution Absolute and relative mV modes Adjustable isopotential point pH autocalibration; calibrate at up to five pH/ISE points Auto blank correction Manual or automatic temperature compensation with optional probe Self-diagnostics and user prompts Choice of printout options at ready, at timed intervals, or on demand Memory storage for calibration and data points Two-way RS-232-C port Models 920 Aplus™ and 720Aplus provide dual inputs, store two sets of calibration in memory; have recorder and KF outputs and numeric keypad Model 920Aplus permits incremental ISE techniques; Model 920Aplus gives temperature-corrected ISE readout and electrode identification; has calibration edit function for changing one or more calibration points without doing a complete calibration Models 920Aplus and 720Aplus Autobuffer recognition and 25-point datalogging including time/date of last calibration; have vacuum fluorescent display Warranty and Services Three years