The Lafayette Manual Muscle Tester Lafayette (MMT) is used to measure different types of grip strength and detect grip strength variations. The Lafayette MMT is ergonomically designed to fit the therapist's hand. 9 volt battery (included). The interactive menu allows the user to select a wide range of options such as data storage, test times (1-10 seconds), and choice of high and low threshold settings. In our interventions as we perform applications of strengthening exercise protocols it is essential to quantify the force performed by the subjects and specially to objectify it by means of the isometric maximal force value.