Boley Gauge helps in determining tooth dimensions of length, width, and thickness in millimeter increments. It is used for measuring teeth and spaces. The flat end is good for measuring teeth size and distance of spaces in the mouth. A device used to measure lengths and widths. The metric scale on the gauge can be used for determining the exact dimensions of an object or space, such as when selecting denture teeth to fit the space. The gauge can also be quickly measure a dimension for quick and accurate comparison with another object, such as when comparing the widths of teeth on one side of the mouth with the other.