The HQ11d Digital pH Meter features one probe port for use with any of Hach's IntelliCAL? pH probes. "Smart" meters store probe serial numbers, calibration history, user ID, time, date and location of readings.

All data (up to 500 results) can be accessed using the simple menu-driven interface with intuitive icons.
  Specs at a glance:

Display Readings from One Probe
pH Probes: pH, mV, temperature
Data Memory: 500 results — GLP/ISO compliant reading data stored with calibration details. Calibration details and check standard readings documented as events in log. Operates in "press to read" mode, continuous read mode, and interval measurement mode. Store data internally and/or download via USB connection to PC or flash stick.
Temperature Correction/Compensation: Off/automatic/manual
Display Lock Function: Freezes results display, including time and temperature, when stability criteria are met.
Automatic pH Buffer Recognition: Choose from 3 sets: Color-coded: 4, 7, and 10 pH; IUPAC: 1.679, 4.005, 7.000, 10.012; DIN: 1.09, 4.65, 9.23
Water Resistance: Meter Casing: 1 meter submersion for 30 minutes (IP67)