You tried to explain the 220 voltage measurement very well from the beginning to the end it was very good but still I am very afraid of such foreign works because there is a possibility of hobbyism and also these works are very risky so I am such I try to stay away from the work full time but maybe you have become a habit of doing these things so you have gained a lot of experience here so it is perfect I hope something good is waiting for you in the future.