If you are generally interested in knowing about what kind of psychological tests that could be used in workplace then this is an excellent book to read. It provides an extensive survey of several dozens of psychological tests, classified by the purpose they serve.
What I liked the most is chapter three briefly covering history of workplace testing. Then there is another chapter (#7) that is dedicated to probably the most popular psychological test at workplace – Myers-Briggs Type Indicator (MBTI). Other chapters that could be of interest include the ones covering tests related to leadership and emotional intelligence.
In all, it is a book to read if you do not know much about psychological tests but wish to know the basics within few hours.