Abstract: A device for measurement of deviation of a surface being assessed from a reference axis includes a device body having a means for determining a pre-selected reference axis, the means including a reference surface of the device body which can be aligned with the reference axis, and an indicator on the device body for indicating alignment of the reference surface with the reference axis. A deviation meter connected to the device body is configured to measure the extent of deviation from the reference axis, wherein the deviation meter includes a reference point and a gauging means indicating the measure of the deviation of the reference point from the reference surface. An adjuster is configured to adjust the relative position of the reference point of the deviation meter to the reference surface of the device.