I don't even use a caliper. When I need it, I just cut a gauge from a piece of carboard, to the right float height, and discard it. It takes less time to make a new one if I need it, than to try to find it after years. In theory, float height should only have to be adjusted once. If I have to clean my carbs in the future, I know the height was already set to specs, so no need to adjust it....