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Microbiological inhibition tests like the German Three-Plates-Test (TPT) or the New Netherland-Kidney-Test (NNKT) are requiring a relatively large amount of time until test results are available. Moreover theydo not seem to be appropriate for automation efforts. Using an impedimetric method could lead to certain improvements. In trials by using aMalthus Growth Analyzer, Bacillus stearothermophilus was found to be the most appropriate test organism. After investigations in order to find the appropriate framework, the sensitivity to detect certain antibiotics, i.e. Erythromycin, Gentamicin, Streptomycin, Chlortetracyclin,Oxytetracyclin, Penicillin G, Amoxicillin, Chloramphenicol and Polymyxin B, were examined and compared with the sensitivity of TPT and NNKT. Reliable results were available after an incubation period of 3.5 h. The sensitivity were within the maximum residue limits (MRLs) which were given by the European Community and seemed to be almost equivalentto those of the TPT. When using the impedimetric method, we suggest the use of meat liquid which can be gained by centrifugation.