Sprinkler and Micro Irrigation

In micro-irrigation, 1 inch equals $25.4\text{ mm}$. If a 100-mesh screen has 100 openings per inch and wire diameter is negligible, the aperture size in mm is approximately $25.4 / 100 = 0.254\text{ mm}$ ($254\text{ \mu m}$). For 200 mesh, the theoretical aperture size $25.4 / 200$ in mm is: