Shoe mounted gradiometer tool and method of adjustment

A method of adjusting the positioning of a shoe mounted gradiometer tool on a shoe, comprising:

• providing a shoe mounted gradiometer tool, the tool comprising:
• an enclosed housing having a convex interior base and a transparent top, the convex interior base having a marked level position and a lowest position;
• a ball disposed within the enclosed housing, the ball sized and shaped to roll on the convex interior base;
• and
• a mounting piece having a fastener-receiving hole, the mounting piece connected to the enclosed housing;
• placing a fastener through the fastener-receiving hole of the mounting piece and connecting the fastener loosely to a shoe;
• adjusting the orientation of the enclosed housing by pivoting the enclosed housing around the fastener-receiving hole of the mounting piece so that the marked level position corresponds to the lowest position;
• and
• securing the mounting piece fixedly to the shoe.