A requirement of obtaining a license is for you to be aware of how you are going to dispose of your gauge when you are done using it. Perhaps the gauge is too old and not worth fixing, or the job for which you obtained the gauge has ended. The important thing to know is you can’t just throw the gauge in a dumpster or scrap yard. It must be properly disposed or transferred and you must generally know which of these actions you are going to exercise even before you buy the gauge.
Your agency is going to have very specific requirements as to your knowledge of disposal options. But be careful, many independent disposal options can be very expensive. Try and stick with options within the moisture density gauge market – manufacturers, service providers and other properly licensed gauge users.