This HTML based tutorial describes the process of determining the magnetic susceptibility of a sample. Normally the sample is a solid, though liquid samples certainly could be used as well. Again, because magnetic susceptibility is less well known, a tutorial on the theory involved in the measurement is presented before the details of data collection. The tutorial is written to support two different methods, one using measurements made on small amount of a solid sample in a relatively inexpensive device obtained from Johnson Matthey, Inc., and the other using measurements made on a solution of the test material in a nuclear magnetic resonance instrument. You should be aware that the discussion of theory can get quite involved, but we believe it to be pedagogically sound.