American HACH HQ11D digital pH analyzer detailed introduction:

HQ11D digital pH analyzer can be used with any standard pH IntelliCAL from Hash Company. HQ11D uses a lot of advanced software and technology, making it a very economical measurement method. Calibration data and calibration history can be carried out with each IntelliCAL meter, allowing operators to exchange calibrated meters between analyzers. Electricity should be calibrated in a controllable environment and can be used on-site. Automatic detection of standard procedures and calibration reminders can ensure the accuracy of data. Each measured sample ID, user ID, and electrical serial number can be linked, and a total of 500 data records can be stored.

Technical parameters of HACH HQ11D digital pH analyzer in the United States:
Please refer to the technical parameters for pH measurement range
Power supply: 4AA battery; Battery life:>200 hours, including AC/DC power connection
Language: Optional: English, French, German, Italian, and Spanish
Single parameter display: can display 1 reading.
Data memory: 500 sets of data
Data storage: Calibration data is stored in logs. It can be automatically stored in the "press to read" mode and interval measurement mode. Manual storage is required in the 'continuous reading' mode.
Temperature correction/compensation: automatic shutdown
Lock display function: Continuous measurement mode or press to read measurement mode (with numerical averaging function).
Automatic recognition standard: There are three options to choose from:
Color classification: 4, 7, 10pH
IUPAC： 1.679，4.005，7.000，10.012，
DIN： 1.09，4.65，9.23
Waterproof: The measuring instrument casing can be soaked in water up to 1 meter deep for 30 minutes (IP67)

HQD series multi parameter measuring instrument - Host model and technical specifications: