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The difference in elevation between two closely spaced points on a surface is sensed by an instrument that is sequentially positioned at equally spaced locations along a measurement line to provide data from which a surface profile may be plotted. The instrument frame mounts a sensor having a sensit

The difference in elevation between two closely spaced points on a surface is sensed by an instrument that is sequentially positioned at equally spaced locations along a measurement line to provide data from which a surface profile may be plotted. The instrument frame mounts a sensor having a sensitivity axis parallel to a contact line connecting pivot contact points at which the instrument engages the surface to provide a readout adjusted and calibrated to be in terms of vertical distance between the two contact points.

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In a device for measuring flatness deviations of a surface profile having an undulation wavelength, including a rigid frame, an inclination sensor mounted on the frame and having a sensitivity axis extending therethrough, and signal readout means connected to the sensor for indicating inclination me

In a device for measuring flatness deviations of a surface profile having an undulation wavelength, including a rigid frame, an inclination sensor mounted on the frame and having a sensitivity axis extending therethrough, and signal readout means connected to the sensor for indicating inclination measurements of said sensitivity axis, the improvement comprising a pair of frame supporting elements mounted on the frame a fixed distance from each other along said sensitivity axis, each of the said supporting elements having surface contacting means engageable with the surface at point locations, means connected to the frame for angular displacement thereof about one of the point locations at which the frame may be pivoted, and signal adjustment means connected to the signal readout means for converting said inclination measurements into elevation differences between the surface contacting means of the respective frame supporting elements.