Patent ID: 8434237
Filing Date: 2013-05-07
Classification: G01C

Abstract:
1. An illuminated level comprising a housing arranged for placing on or attachment to an object to be levelled; a solid body pivotally mounted in the housing and forming a pendulum which can pivot to a first position in which the object is accurately level and to second positions on either side of the first position; a light path through the solid body having an entry opening at one end and an exit opening at a second end; a source of light on the housing arranged to transmit light through an orifice on the housing; the solid body being arranged such that the light through the orifice enters the entry opening to pass along the path when the solid body is in the first position and is prevented from entering the entry opening when the solid body is in one of the second positions; and a light receiver responsive to the passage of light through the path for indicating when the solid body is in the first position and therefore the surface is accurately level.