A regular maintenance,together with a valid calibration, is the key for a precise ambient air measurement and an very good data coverage. You can find the maintenance schedule for the airpointer here:  Maintenance Schedule

Below, you find a list of useful tools for the maintenance, repair, and calibration of the Airpointer, including the content of the official Recordum Toolbox:
Tools

Below you find the documentation and tutorials to do the proper work:
How to...

Of course, a maybe even better start is to ask your distributor for training in case you are new in this kind of business or not familiar with our instruments.