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

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.

ETS Tests and Measurements

ETS Test Collection

ETS Test Collection  A database of descriptive information about over 25,000 tests. Offers useful information about where the tests are published and how to obtain a copy