There is a definition of uniform grid, where the size of the grid remains the same throughout. meshgrid
will always produce a uniform grid. The x-direction and y-direction grid increments can differ in this case. You should not worry about the the increments as such if it solves your use-case.
The unit of increment is same as the unit of axis. For example, if the unit of the axis is meters, then the unit of increment would be 0.005 meters, if your increment size if 0.005.