To optimize imaging in the TEM a beam alignment needs to be done ahead of use. A Device for this alignment can be a holey grid. A holey grid is often a TEM grid assist coated with a thin plastic film along with a stabilizing carbon layer.Bên c?nh nh?ng ?u ?i?m nh? trên thì Decal nh?a trong có m?t h?n ch? khi?n cho nhi?u ng??i ph?i cân nh?c tr?