Which jobs are the most tiring in Changzhou jingyan science and technology assembly line?

According to official website, Jingyan Technology Company, Changzhou, Jiangsu, the work of quality inspectors and full inspectors on the assembly line is the most tiring, but the salary is also very high. The quality inspector needs to check the products used within his scope every day, and the full inspector needs to check the products checked by the quality inspector for the second time. The workload is very heavy and the working hours are not fixed.