1, self-made measuring instruments, which are not directly related to quality. If the electrician's multimeter is only used to measure whether the circuit is powered off or not, the multimeter can only be calibrated internally, but it must be marked on the outside of the instrument, and the external audit should be clearly distinguished. There should be school records, school labels, school contents (items), etc. Test instruments directly related to quality, such as oscilloscopes and multimeters, need external calibration.

2, the internal school must have a measurement qualification certificate, but it can be trained within the company. This is no problem, but there must be training records and contents. At the very least, you should have the company's self-made qualification certificate for on-campus metrology personnel.

I'm not sure about the training point in Shenzhen. Radio 7 trained by our company in Guangzhou is also available in Guangzhou Metrology Research Institute.