an apparatus and a procedure to detect and quantify the microorganisms concentration in anaerobe ecosystems , for instance , sulfate - reducing bacteria in oil producing systems or industrial or urban waste - waters production systems , as well as in aerobe microbial ecosystems , for instance in the industrial , clinical fields , etc . the apparatus analyzes the growth of microorganisms in cells provided with a culture medium by conducting automatic , continuous , and simultaneous measurements of the impedance components between at least two electrodes immersed in the culture medium and the turbidity measurements of the inoculated medium . the use of two incubators makes it possible to conduct simultaneous analysis at two different temperatures . the determination of the growth threshold detection time makes it possible to quantify the microorganisms concentration in an unknown sample .