Universal float level gauge. This is a heavy duty metal tool for measuring the carburetor float height. It's important to make sure the float height is correct so there isn't too much or too little fuel in the float bowl. It has mm markings up to 45mm, but the float height can be measured up to 40mm. Two of the arms are adjustable so it is a universal tool that can be used on most carburetors. Make sure to measure both sides of the float and make adjustments so they are the same exact height.