This tool measures toe-in and toe-out on an easy-to-read gauge. To use, set the gauge at the rear of the front tires and take your measurements. Then, transfer the tool to the front of the tires and measure the difference. If necessary, adjust the tie rods in or out half the distance of the dial reading. The cost of this tool is $54.99. In a pinch you can use a tape measure to adjust toe-in specifications but for a more consistent and accurate reading a rigid bar is more desirable.