1. On-the-job physical examination refers to the physical examination conducted by employees before taking up their posts to ensure their health and competence. Physical examination usually includes various physical indicators, such as height, weight, blood pressure, vision, hearing, electrocardiogram, and some specific tests, such as liver function, lung function, blood routine and so on. The results of on-the-job physical examination are generally issued by doctors for employers' reference.
2. Health certificate refers to the certificate issued by the health department or hospital, which proves that the holder is in good health and meets the health requirements of some jobs. Health certificates are usually aimed at certain industries or occupations, such as food industry, medical industry, education industry and so on. People with health certificates usually need regular physical examinations to ensure that they are healthy and meet the requirements of specific jobs.