validity: The validity of this test as a measure of general strength has been questioned, as the strength of the forearm muscles does not necessarily represent the strength of other muscle groups. If you wish to measure the strength of a particular muscle group, there are other specific tests that can be performed.
reliability: the dynamometer may need to be calibrated regularly to ensure consistent results. Having consistent technique and adequate rest is required to ensure reliability.
advantages: This is a simple and commonly used test of general strength level, well researched and many norms are available.