Screen printed electrodes (SPE) are types of electrodes fabricated using different types of inks on various substrates such as plastics or ceramics. The major advantage is their low cost which makes them easy to access substrates for the development of disposable sensors, however, their quality can be variable . Carbon is the most used ink for SPE which can then be additionally altered with other metals, polymers, or enzymes, depending on the application. An example for one such application has been reported . Briefly, peptide nucleic acid (PNA) probe was immobilized onto the screen-printed carbon electrode (SPCE) by applying a potential of -0.5 V to working electrode for 300 seconds. It is worth mentioning that PNA is an uncharged synthetic polymer similar to DNA and RNA and it can be applied as an alternative to oligonucleotides. PNA binds the complementary DNA or RNA with high affinity and high specificity which results in more stable complexes compared to natural nucleic acids.