Patent ID: 7607999

Claim:
A green reading device comprising: a housing; a lens assembly secured to the housing said lens assembly comprising at least one lens having a front surface, a back surface and a peripheral side edge; said peripheral side edge defining a plane of said lens; said at least one lens being solid and comprising a light transmitting material between said front and back surfaces of said lens; the lens having a reference line which is capable of being illuminated; and an electrical circuit comprising; a power source; at least one light source, the at least one light source being electrically connected to the power source; said at least one light source being positioned to direct light through the lens material between the front and back surfaces of the lens in a direction generally parallel to said plane of said lens; the light from the light source illuminating the reference line when the light source is activated; and at least one level switch, the at least one level switch being electrically connected to the power source and the at least one light source so that the level switch activates the at least one light source when the reference line is in either a horizontal or vertical orientation.