Abstract: A diagnostic device evaluates microbial content of a sample. In some embodiments, the diagnostic device includes a plurality of sample cells in which the microbial content of a sample is evaluated. Electronic circuitry is used to apply electrical signals to electrodes that interact with the sample in the sample cells. The electronic circuitry also measures one or more characteristics of the sample. Using the measured characteristics, the diagnostic device performs one or more of: identifying microbes, counting microbes, and determining antimicrobial sensitivity of microbes within the sample.