Patent ID: 7243435

Claim:
A method of calibrating an elongated level vial with respect to two reference surfaces of a level body on which the vial is mounted, said surfaces being orthogonal with respect to each other, and said level vial having a transparent hollow body defining a sealed cavity partially filled with fluid so as to define a fluid bubble, said bubble providing an indication that said vial is level in its direction of elongation when said fluid bubble comes to rest at a mid-point of said vial, comprising the steps of: providing a level body, said level body defining two orthogonal reference surfaces, providing a vial carrier on said level body, said vial carrier holding a level vial, placing a first reference surface of said level body in contact with a calibration surface, adjusting the position of said vial with respect to said vial carrier by rotating the vial about a first adjustment axis perpendicular to said direction of elongation of said vial, rotating said level body by substantially 90 degrees about an axis parallel to said direction of elongation of said vial, placing a second reference surface of said level body in contact with a calibration surface, and adjusting the position of said vial by rotating said vial carrier about a second adjustment axis perpendicular to both said direction of elongation and said first adjustment axis.