Inch (in): The inch is equal to 1/12th of a foot or 0.0254 meters. It is used in various applications, including measuring the size of screens, paper, and some smaller objects.
The term "long reed" does not refer to a standard unit of measurement or a widely recognized term in contemporary systems of measurement. It's possible that "long reed" is used in a specific context or industry, but it does not have a standard definition in general measurements.
If you have more context or specific information about how "long reed" is used, I would be happy to try to provide a more precise explanation.