Calibration of noise sensor

We are looking into starting a noise sensor project in Iceland. Our idea is still in the general conceptualization phase.
One of the problems we can currently identify is the calibration of the microphone. A noise engineer working on our team is worried about the detoriation of the quality of the data with time. Has this been addressed elsewhere here?
We would like to use the IM72D128 due to the waterproofing of the microphone.

Hi,
Please check:

Maybe you can contact Helmut Bitter.