Simultaneous display of... pH or mV Temperature Date & Time Automatic Stability Function PIN Code Access Programmable "Calibration Due" Alarm 240 x 64 dot graphic display with large digits, full text messages and backlight. 2730 reading memory with Automatic Datalogging. RS232 computer interface port. Automatic calibration. Readout of probe condition for instant troubleshooting. Fully waterproof design.