Eka Rahamadi Susilo, Akim M.H Pardede and Siswan Syahputra 2022. Design And Development Of Formalin Levels Detection In Food Based On Arduino Nano Microcontroller Using Fuzzy Method. International Journal of Health Engineering and Technology (IJHET). 1, 3 (Sep. 2022). DOI:https://doi.org/10.55227/ijhet.v1i3.52.