Directional two-axis differential optical inclinometer

A directional two-axis differential optical inclinometer comprising a container having an opaque liquid therein partially filling said container, a light source for emitting collimated light toward a reflective surface of said opaque liquid and a quadrant detector mounted on said container and detecting light reflected from said reflective surface, said quadrant detector having outputs that are fed to a dual indicator, said container also having two pairs of optical detectors with one pair of said detectors being mounted perpendicular to the other pair of detectors and each pair of detectors being oppositely facing and parallel to each other with the liquid partially covering said each pair of detectors, a diffused light source mounted on said container and providing light to exposed surfaces of said two pairs of optical detectors that are above the level of opaque liquid, and each of said detectors of said two pairs of detectors having an output that is connected to said dual indicator where a differential readout is produced which is indicative of tilt of said incinometer.