The main control panel does not operate right after upper cover is unlocked. This key is used to stop the whole unit in case of emergency. 90 watt AC/DC low voltage power supply could give 1, 3, 5, 4.5, 6, 7.5, 9, 12 V energy as can be selected with a key. It provides the opportunity to give power to each student's table separately. There are two ammeters. They control the experiments conducted by students. Student tables receive gas though the central / main control unit. In case of emergency, the teacher can block gas current to all student tables. For panel display not to get wet, a valve-system blocks water flow from the until panel cover is closed. In addition to that, there is a voltmeter that displays line voltage. All displays are digital. The cabin is painted withelectrostatic powder paint. Gas pipefitting are imported products and have special liquid gasket.