This might be helpful. Think I will order one for my side focus that does not have a wheel, where I can't apply large numbers easily.
https://mkmachining.com/product/turret-magnifier/?wccp_component_selection%5B1565973233%5D=15442&wccp_component_quantity%5B1565973233%5D=1
https://mkmachining.com/product/turret-magnifier/?wccp_component_selection%5B1565973233%5D=15442&wccp_component_quantity%5B1565973233%5D=1