there are many kinds of engraving machines on products. Generally, pneumatic marking machine and laser marking machine are commonly used. If the material is nonmetal, such as plastic, glass, ceramics, etc., you can use co2 laser marking machine. There are also two kinds of co2 laser marking machines, including desktop co2 laser marking machine and portable co2 laser marking machine. If it is made of metal, it depends on what kind of effect you want to determine whether to use a pneumatic marking machine or a laser marking machine. Pneumatic marking machine can play deep, laser marking machine can play very delicate. Specifically, it should be decided according to the material and marking requirements of the product.