Mesh size measures the number of openings in the mesh that make up one linear inch. The smaller the mesh number, the bigger the particles that can pass through. Mesh number 6 will allow larger Particles to pass through it than a mesh size of number 10.

Microns and mesh size measure the same thing, but differently. Micron measurements tell you the size of the opening in the screen or strainers. This will tell you what size particles it will capture. Mesh size tells you how many openings there are in an inch, which can be calculated to provide you with the same information.

Mesh sizes are not all the same. They can vary depending on the screen construction and the use of different materials. In the case of wire screen not all are exact. The strand sizes can vary in thickness.