A disinfectant, especially a skin disinfectant, an antiseptic agent for open wounds and a preparation for biocidal impregnation of plants, objects or materials, especially porous objects or materials containing cellulose, plastic or textile fibres, distinguishing itself by containing 10 to 99. A specimen testing device is configured to output an image of absorbed current output from two probes during scanning of an electron beam so as to be operatively associated with the scanning of the electron beam and includes the following mechanism. For further diagnosis, the fungal species are then determined from the extracted fungal DNA.