A system for measuring a palmar gripping force comprising a device for measuring said palmar gripping force which comprises - a handle configured to receive a palmar gripping force, the handle comprising an outer frame formed by several elements including two lateral bars 15, - a force sensor configured to measure said palmar gripping force, - an electronic module integrated in the device , fastened on the outer frame and comprising at least one microcontroller connected to the sensor and adapted to process data originating from said sensor disposed against said electronic module, characterized in that the handle includes an inner frame including two juxtaposed lateral bars guided and parallel to the lateral bars of the outer frame, and the system comprises an axis linking the force sensor to the inner frame and a strain gauge adapted to detect efforts from a zero or almost zero value, and which has a minimum accuracy of about 50g for a measurement range from 0 to 90kg, and/or a sensitivity lower than about 10 g, and in that the electronic module comprises means adapted to carry out the following actions: (a)- calibrating the sensor , wherein: (a1)- the sensor receives a plurality of calibration forces (F0, F1, F2, F3, F4), (a2)- establishing a linear calibration function (D) from calibration points where a first coordinate is a sensor measurement (X0-X4) and a second coordinate (Y0-Y4) is the value of said calibration force, said calibration function being piecewise linear, (b)- recording a palmar gripping force value according to a first coordinate (X z ) of a point of the linear calibration function (D), and determine a calibrated force value corresponding to the second coordinate (Y z ) of said point of the linear calibration function (D). - a handle configured to receive a palmar gripping force, the handle comprising an outer frame formed by several elements including two lateral bars 15, - a force sensor configured to measure said palmar gripping force, - an electronic module integrated in the device , fastened on the outer frame and comprising at least one microcontroller connected to the sensor and adapted to process data originating from said sensor disposed against said electronic module, (a)- calibrating the sensor , wherein: (a1)- the sensor receives a plurality of calibration forces (F0, F1, F2, F3, F4), (a2)- establishing a linear calibration function (D) from calibration points where a first coordinate is a sensor measurement (X0-X4) and a second coordinate (Y0-Y4) is the value of said calibration force, said calibration function being piecewise linear, (a1)- the sensor receives a plurality of calibration forces (F0, F1, F2, F3, F4), (a2)- establishing a linear calibration function (D) from calibration points where a first coordinate is a sensor measurement (X0-X4) and a second coordinate (Y0-Y4) is the value of said calibration force, said calibration function being piecewise linear, (b)- recording a palmar gripping force value according to a first coordinate (X z ) of a point of the linear calibration function (D), and determine a calibrated force value corresponding to the second coordinate (Y z ) of said point of the linear calibration function (D). <EOS>