Abstract: A biosensor feedback device for use in detecting a grip pressure and torque of a hand against a handle of a sporting implement. The device includes a flexible thin film substrate which is conformable to the handle of the sporting implement, and an array of digital pressure sensors disposed on the flexible substrate. The sensors are connected to a signal, such as a buzzer, that indicates detection of pressure or torque exceeding a desired threshold. The array of sensors can be divided into two or more sub-arrays of sensors of different sensitivities, and each of the sub-arrays can be connected to (or disconnected from) the signal as desired. The sensor-beating substrate is secured to the handle of the sporting implement by an elongated, stretchable tubular sheath.