Patent ID: 6948252

Claim:
An apparatus for measuring an angle, comprising: a means for producing a first beam of light; a means for producing a second beam of light, wherein said second beam of light is pivotably adjustable so as to move relative to said first beam of light, wherein said means for producing a first beam of light and means for producing a second beam of light comprises: a common light source, and splitting means for splitting a beam output by said common light source into the first beam of light and the second beam of light; means for redirecting at least one of said first and second beams of light from a linear path so as to spread the light and thereby produce a line on a surface where the redirected beam strikes the surface; circuitry for detecting the angle between the first beam of light and the second beam of light and producing an analog signal indicative thereof; and a display for displaying an angular value in response to the analog signal.