Abstract: An electronic level device characterized by an enclosure, a knob and shaft rotatably coupled to the enclosure, and a mercury switch located within the enclosure and attached to an end portion of the shaft. The mercury switch is closed when it is in a gravitationally normal position, and is open when it is tilted from the gravitational norm by more than a predetermined amount. By rotating the knob, the angle at which the mercury switch closes can be varied. An audible alarm is actuated by the closure of the mercury switch.