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This paper aims at experimental analysis of composite box beam to estimate the material uncertainty. The deflection parameter has considered for analyzing the uncertainties present in material. The composite box beam is like a cantilever beam, where one end is fixed and at free end load is applied. In previous study free end deflection is calculated using Dial Gauges whose stylus will make point contact with proposed setup. But due to this contact it will create instrumental errors or manual error during experimentation. To avoid such situation the non contact device is developed called as Hall Effect Sensor which is the electronic device and it is works on electromagnetic field. If magnet is come in front of sensor it create magnetic field between them. The change in voltage or field is calibrated in terms of deflection of beam. In this paper, experimentation has carried out on four composite box beams which are manufactured by same process to find the material uncertainties and then the results are validated with COMSOL Multiphysics, software for same parameters.