Psychological measures (test, scales, inventories, etc.) can be difficult to obtain without paying a fee.
Most often, you need to purchase the test from a commercial publisher or the test's author.
Occasionally, a test will be included with a journal article or printed in part or in full in books.
If you wish to acquire a test for educational purposes, you may be able to obtain a copy free of charge; however, this still entails contacting the publisher or author and stating your purpose for the test.