The input range of the CM3 is 0 - 1V AC RMS.
At 24-bit resolution there are approximately 16.8 million steps so this gives
1 / 16777216 ~= 60nV per step.
The full specifications can be found on the website:http://www.picotech.com/current-data-logger.html
A device running an application (PicoLog or using the Software Development Kit) is necessary in order for data to be collected from the device. If your data collector is unable to do this then I am afraid it won't be possible.
The device can use a Power over Ethernet connection when data is being collected via the Ethernet connection.