The possible use of piezoresistive polyisoprene/ nano-structured carbon black composite sensor in automobile and aircraft weighing systems is discussed in the article. The use of this kind of nanocomposite would allow the making of more general-purpose oriented weighting-machines. Aircrafts with different mass and undercarriage size could be scaled. Furthermore composite would succeed in more simple constructions, reduced material consumption and price of the future weighting units. Even more – the design of the sensing element can be adjusted to the preferable application. The signal of presented nanocomposite is adaptable to already existing data evaluation programs. First of all, the relaxation process of nanocomposites was analyzed. The change of the electrical resistivity just after unloading can be fitted well with the extended exponential function of F.Kolraush. According to this, relaxation process can be divided into two subsequencional parts: fast one refers to the relaxation of crosslinked polymer chains, primary carbon nanoparticles and small size carbon aggregates; slow one refers to relaxation of larger aggregates and agglomerates of carbon nanoparticles. Secondly, statistical evaluation of the experimental results was done by determination of distribution parameters and distribution law evaluation, also the construction of distribution histogram and Gaussian function was done.