Generally, commercially available tests and survey instruments must be purchased from publishers. Those that are not commercially available may be found in books, journal articles, printed reports, the Web or may be available from the author.
Some can be found in the books detailed below. Remember there are always new resources arriving in the library. For more resources try a keyword search including terms like: test*, measure*, survey* or guide*.
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Image by Mivervaa (GNU Free Documentation License, version 1.2)
Barber-Dentist, 16th century, Portugal
Bore Track of Strzelecki Desert, South Australia
Photograph by Kdliss (GNU Free Documentation License, version 1.2)