The application of optical technology permits an accurate measurement of the dimensions of the fiber, without ruining the fiber in any way (as happens with water systems), with elevated repeatability and rapid response times. The analyzing software, in conjunction with the numerous images taken, calculates the actual length (extension) and width of the fiber even in cases where the fibers are laid one over the other. Denser lumps, on the other hand, are not analyzed. The result of each test is stored in the local database and may be consulted over the company network. In addition, the test results may be printed with the figures and the graph showing the granulometry distribution. The impartial verification of test repeatability and/or comparison with previous tests, is made by placing one graph over the other by means of a simple set of menu choices. Automatic cleaning system with connection to external vacuum cleaner.