Clot 2B semi-automatic coagulation analyzer for performing all commonly used tests like Quick test (PT), APTT, Fibrinogen, TT, ATIII, factor assays, etc, with a high level of precision and repeatability. The versatile coagulometer is controlled by microprocessor with turbodensidometric detection of the beginning of the clot formation (fibrin polymerization). It carries out clot detection in positive O.D. variations or even in negative ones in high level fibrino-genemia.