Cheap, available, and renewable.
Seriously. As a graduate student, I was responsible for managing and running a university-wide center for amino acid analysis and protein sequencing. As dedicated staff (namely me) used and maintained the equipment, it was not trashed by poorly-trained users. Proper protocols, sample preparation, calibration, and periodic assay of the standards were all assured.
Other solutions above will monitor access to the equipment, but that is a far cry from ensuring longevity of the equipment or accurate and reproducible results.