Use these databases to obtain a comprehensive description/review of a test/measurement (i.e. reliability, validity, etc.), publisher information, administration, procedures, cost, audience, etc.
Finding an actual instrument can be difficult due to licensing or author restrictions. However, sometimes the instrument is included, and if not, article results may still reveal relevant content about the test and how it was used in the study. If available, the instrument will usually be located in the appendices. The list of references can also be checked for a possible instrument source location.
Appended should help you locate articles with the instrument included in the appendix of the article. There’s likely more info about the tests without the test included, so you might want to try the search without the term “appended” as well.