Nonsense. Strictly speaking, ordinary beauty salons are not allowed to operate photoelectric equipment, which belongs to medical beauty salons. Therefore, getting some so-called certificates can only deceive yourself and others. When the health bureau comes to inspect or there is a customer dispute, if you report it, your instrument will be confiscated and you will be fined. Because it involves illegal medical beauty. Unless your business license is for medical cosmetology and the operator has medical qualifications, or the cosmetology department in a hospital is fine. If you don't meet the conditions, getting a photoelectric instrument operator certificate is just a waste of wax for a blind person.