The Mar khlong on metal. require a high power laser or laser in high level. But because we are low, which is a laser cannot Mar the metal we have on khlong requires technical marks on the metal.
The mark on the metal requires high power lasers or laser level. But because we have a low power laser, which can not mark down on the metal. We need to have a technical mark on the metal.
The mark on the metal used in high power laser or laser high. But since we have the laser is low, which can't mark on the metal. We need to have come down on the metal arc technique