| Data Logger Pro (V5.52) is a big improvement over the free version. But the time error in the .csv data is still there, and is maybe even worse. Automatic sequential files always leave a gap of missing data between the end of one file and the start of the next. The missing data is at least one full minute and sometimes two.
With the free logger version I used extensively, I attributed this gap to bad clock accuracy in the GMC-320+, and corrected each 1-minute sample so that the files were contiguous. I'm no longer sure this is correct. If the data is really missing, the logging feature becomes pretty useless for any serious work. For example, if recording 10-minute sample files, 10% or more of the data will be lost.
Am I missing something here?