The carrot root, which is breeded for fresh use, must contain a lot of high quality characteristics. The quality is refer to physics, chemicals and mechanics characteristics. As it was wished to get the high quality carrot root, breeding technology was very special. It was taken on mini bars, and analized a number of years as an excellent technology. After breeding process, the roots were brought in the laboratory. There were analized physics characteristics: mass, volume, lenght, dencity and sphericity. The variation coefficient of physics characteristics was positive, and the results were shown the uniform in the sample (Jancic M. 2007.). That was important for demands of market. The measurements of mechanics characteristics of carrot root are got from the instrument, which is constructed in the laboratory 'Biosistemic engineering', at Agriculture University in Novi Sad. (Karadzic B. Babic M. Radisic S. 2006). This insrument contains three main components: platform, which is stationary,sounder with cylindrical end, and system for data converter. The small cubical samples of carrot root were pressed by the sounder of this instrument. Mechanic hardness was defined by precise cell for measurement force converter. The results were given by sensor and RS 232 port, and delivered to PC - computer. The data were kept in Excel - files. The instrument was constructed to define the relation between force - deformation. The pressure force curve clearly showed quality textural characteristics of carrot root. The root sample is in solid state till the force reach the value of critical tension. Then the sample is changing in fluid state, i.e. desintegrated state. The diagram tension - relative deformation is based on the force values, relative deformation, tension and sample cross section values. The modul of elasticity,for each sample was given by linear aproximation results from diagram tension - relative deformation and Hook's law. The results of variation coefficient and elasticity modul were uniform in the carrot root sample. The instrument, which is constructed for mechanical characteristic measurements, has a great use in analyses mechanical characteristics of machine materials as in analyses mechanical characteristics of agriculture materials. The instrument has use in analyses of fruit and vegetables hardness in a process of dehidration. At the begining of this work, it was known that the machine materials have precisely fixed critical tension value, and it is always the same in production of that material. The carrot and other agriculture products are made of natural cells and their mechanical hardness may vary. In the carrot root sample, in this production, the values of variation coefficient and elasticity modul were uniform.
