Abstract: Under hydrostatic pressure, the cross section of a Single Wall Carbon Nanotube (SWNT) reduces uniformly and proportionally to the applied pressure until it reaches to SWNT`s first transition pressure. In addition, SWNT kinks, becomes unstable and collapses on a ground plane due to bending loads. This phenomenon is a function of SWNT diameter. Bending loads can be generated by inducing a voltage between SWNT and a conductive ground plane. Therefore, by inducing a certain Pull-in voltage relative to a certain diameter (pressure), SWNT does not collapse until the applied pressure reaches to a certain amount which causes a certain SWNT diameter reduction. In this case, because of SWNT collapse on the ground plane, there will be a connection between them closing an electric circuit. In this study, these characteristics are employed to introduce a tuneable pressure switch. This type of pressure switch, in comparison to previous presented one, uses only one SWNT for switching, is able to sense pressure with higher resolution and has a much simpler system.