Given the significant role played by psychometric instruments in the practice of Quebec guidance counsellors (C.O.s), the wide diversity of these instruments and the concern for their proper use, it seems important to support C.O.s in the use of these instruments. To do so, it is important to know which psychological constructs are being evaluated and which psychometric instruments are being used, both of which remain poorly documented to date. This article presents the results of an online survey on the main psychometric instruments used by Quebec c.o.s (n = 302) working in various sectors in recent years. The results show that the main constructs assessed by c.o.s are professional interests, personality, values and aptitudes. Also, although c.o.s use a wide variety of psychometric instruments, career interest inventories remain the main instruments used. The top ten instruments used by c.o.s also show that personality inventories play an important role. There are also variations according to workplace. The discussion compares the results with those of a comparable survey conducted in 2010.