Use Psyctests to find full texts of tests and measures. This database from APA has full text of almost 9,000 measures.
In addition, you can find DOIs in PsycINFO and put them into PsycTESTS. Click on the title of the article, then scroll down to see if there's a section called "Tests and Measures." If any of the tests listed has a DOI, it has an entry in PsycTESTS:
Mental Measurements Yearbook
A database of descriptive information and edited reviews for over 7,000 commercially available testing instruments. Print editions 1-17 (1938-2007) in Reference Storage BF 421 .B96.