Frailty in elder people is becoming a major concern with the passage of years because of the world population ageing. The early diagnosis of frailty might be used in the future to prevent and care in a better manner the health of a person, and thus, improve his/her life conditions. The results of this project are the design of a wearable device to measure grip strength and walk time embedded in an anti-stress ball, the design and implementation of a fast prototype and the design and implementation of a compressive force calibration system. The presented fast prototype shows that it would be feasible to produce an anti-stress ball able to monitor and diagnose frailty in old people; but, a trial on old people shall be first performed in order to obtain a proper threshold for weak grip strength criterion using the anti-stress ball.