Which certificate refers to the professional qualification certificate of the laboratory director of the mixing station, which is the so-called employment certificate? Highway inspector certificate of

Which certificate refers to the professional qualification certificate of the laboratory director of the mixing station, which is the so-called employment certificate? Highway inspector certificate of Ministry of Communications? I wonder which province the landlord is from? Because I don't know if it's the same everywhere.

I come from Hubei province. Everyone in the commercial concrete laboratory, including the quality inspector, documenter, experimenter and director, must first have the inspector certificate issued by the Hubei Provincial Construction Engineering Quality and Safety Supervision Station, and then the director must have the intermediate engineer certificate.

Inspector certificate is a training course held regularly every year by Jian 'an General Station. We study, train, and then get it through exams.