To enhance imaging inside the TEM a beam alignment must be performed ahead of use. A Resource for this alignment is a holey grid. A holey grid is a TEM grid assistance coated with a skinny plastic film and also a stabilizing carbon layer.Vi?c l?a ch?n lo?i decal ?? in tem dán r?t quan tr?ng. ??i v?i các dòng s?n ph?m ???c b?o qu?n trong môi tr?