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The MicroTester developed by our company is based on the detection of the change in redox-potential caused by microbial activity. The evaluation system of the instrument is similar to the impedimetric method’s, but with wider field of application.

The energy source of the microbial growth is the biological oxidation which results in a reduction in the environment. This is due to the oxygen depletion and the production of reducing compounds in the nutrient medium.

The redox potential is one of the most complex indicators of the physiological state of microbial cultures and its measurement could be a useful tool for the qualitative and quantitative determination of the microbial contamination.

Screenshot of software

MicroTester can be used favourably for evaluating the classical membrane-filtration and surface swabbing methods. During inspection of the microbial count of natural water sources, drinking water, mineral water and other beverages usually consecutive members of the dilution series are membrane-filtered and placing the filters on agar surface, the samples are incubated. The reason for using different dilutions in the classical method is that the samples can be evaluated reliably only in a specific interval (between 30-300 cells). Because MicroTester – with determining the calibration curves – is able to carry out measurements and reliably determines the cell concentration in a wide interval (between 1-107 cells), there is no need for dilution series; it is enough to make only one membrane filtration from a sample. Similarly, in case of the microbiological control of surfaces by swabbing, the swab could be put directly into the measuring cell, without any washing and dilution.


During the laboratory and industrial validation of MicroTester the typical characteristics were considered:


MicroTester system