9 electrodes; biochip sensors for detecting antibody, antigen, protein, peptide, pathogen, hormone, enzyme, DNA, RNA, chemical compound, aptamer for research or scientific purposes; Biosensors for detecting antibody, antigen, protein, peptide, pathogen, hormone, enzyme, DNA, RNA, chemical compound, aptamer for research or scientific purposes; Digital sensor for detecting antibody, antigen, protein, peptide, pathogen, hormone, enzyme, DNA, RNA, chemical compound, aptamer; electric sensors; electronic sensors for detecting antibody, antigen, protein, peptide, pathogen, hormone, enzyme, DNA, RNA, chemical compound, aptamer; current sensors being a sensor for detecting electrical current