Our pH controller and temperature controller TC1 are able to work with this data logger.  The data logger  uses the 4-20mA output from the device to record readings.  

The readings can be taken from 1 second intervals to 1 per 12 hours period.

Very easy to set the reading frequency, alarm points, and export the data to a spreadsheet, etc.

The data logger is designed to work with our pH controller and alarm model pH-1

USB software download here

Graph of pH reading logged
EXAMPLE pH READINGS
Datlogger
DATA LOGGER PLUGGED IN

Order Here

DATA LOGGERData Logger USB Stick

This data logger device plugs into the USB slot on our units.   Windows software to operate it is free. (link here)
[DL-1] $164