Data loggers are superior to traditional chart recorders as they are typically much smaller in size, don’t use consumables (paper charts), and because the data is recorded as a data file, there are no paper charts that have to be stored.
Where typical chart recorders can only record up to around 30 days most digital data loggers can record anywhere from 6 months to over a year.
Being an electronic file also makes it much easier to share your data with others.