System and method for providing an interactive collaborative display for sharing electronic data in an educational environment. The device includes a trigger switching module, a firing mode selecting module, a control module, a power module and a motor module. The plasma-generating substrate has one or more flow paths for an exhaust gas. Thereby, the intake pressure can be detected to a high degree of accuracy in a two-cycle engine, for example, which has a relatively low intake negative pressure, while achieving cost reductions. In other embodiments, the mark can be used to monitor aberrations of a lens in an optical photolithography system.