Absolute Expression
Mesh sizes for volumes can be specified as expressions. To specify an Absolute Expression, set the Mesh size type to Absolute Expression.
Clicking on the button next to the Absolute mesh size expression opens the Text Area Editor. A simple expression is shown in the editor that sets the mesh size to 0.005m when the value of x location in that volume is greater than 0.01. The mesh size is set to 0.001 otherwise.