A portable handheld device (20) for use by a therapist to measure angles and forces associated with a joint of a patient. The device (20) comprises a housing (22) with a contact pad (26) that is arranged to contact a body part associated with the joint and a hand piece (24) for the therapist to grip. A goniometer is mounted within the housing (22) and is arranged to measure the angular position of the body part when it is in contact with the contact pad (26) and generate representative angle data. A force sensor is coupled to the contact pad (26) and is arranged to measure the force applied by the body part to the contact pad (26) and generate representative force data. A control system is also provided and is arranged to operate the goniometer and force sensor simultaneously to capture measurements of angle data and force data simultaneously.