The MSU Libraries have a long-standing policy of providing information about tests and measures, but not the actual instrument. Online resources provide many instruments, but it remains true that MSU does not have a unique collection. One prominent resource for tests and measures is the APA's PsycTESTS. More extensive information about Testing Resources at MSU is available on the web at https://libguides.lib.msu.edu/tests
Finding information about a specific instrument is usually fairly straightforward. The HaPI (Health and Psychosocial Instruments) index is the place to start. Another major tool, available in both print and online formats is the Buros Institute's Mental Measurements Yearbook (located within the library at Reference, 1 Center - BF431 .A1 M4) and it's companion index volumes Tests In Print (located within the library at Basement West - BF431 .A1 M47. Together these provide descriptive information, references, critical reviews, and purchase information for commercially available English language tests. However, abbreviations and acronyms can make these resources difficult to use. Allow time to read the introduction and help screens.
Many of the tests developed during research studies never become commercially available. The instrument may be reproduced in an appendix of the report or as part of a table. Of course, such tests also do not undergo the scrutiny for reliability and validity that a published test receives. Many of the most useful of these tests from the fields of education and psychology are listed in Directory of Unpublished Experimental Measures (located within the library at Reference, 1 East - BF431 .G624). This series of seven volumes indexes instruments that have appeared in journal articles. The Libraries also have Tests in Microfiche (located within the library at Reference 1 East - LB3051 .E77 2000), which is a poorly indexed collection of tests from the Educational Testing Service. Tests in the set are not commercially available and may be reproduced for research use.