Mental Measurements Yearbook (MMY)
A directory of published tests. For each test you'll also find a brief test descriptions, publisher contact information, pricing and information about available validity, reliability and norming data. Most entries contain one or more test reviews.
PsycINFO (psychology), CINAHL (health) and ERIC (education)
Journals sometimes publish articles critiquing or comparing instruments. To search all 3 databases together, go into one of them, then click the "Choose Databases" and make sure PsycINFO, CINAHL and ERIC are all selected.
Line 1: Type the name of the instrument
Line 2: Type: validity OR reliability