A 200 mesh screen has larger wires than a 100 mesh screen.

A 100 wire mesh screen will prevent passage of smaller particles than a 200 wire mesh screen.

A 200 wire mesh screen and a 100 wire mesh screen both prevent passage of the same size particles, but each allows a different number of particles to pass through.

A 200 wire mesh screen will prevent passage of smaller particles than a 100 wire mesh screen.