And who calibrates the units and insures that they are operating properly?
This is simply a private company making money off the public by selling these units to anyone who wants them - and who knows if the people who are installing them can calibrate them and insure that they are operating properly month-to-month.
Don’t be fooled by the fancy sounding name of the company ... :-) ...
Do you not understand that these data are quite valuable to researchers?
How do you make it through life?
You should take a class in applied statistics.
As long as the transponder remains in the same spot for a long time, calibration is irrelevant. Its comparative relationships and means that matter.