What are the instrument calibration institutions? Where is the authority and the scale is relatively large?
I recommend radio and television, in the country with more than 20 branches, in Guangdong Province Quality Supervision Bureau has a record, the number of recorded standards of measurement only after Southern China Province, in second.
The third party fair laboratory specializing in instrument calibration, instrument calibration, instrument measurement and related information training.
The instrument calibration and testing institution, Boluo, is entrusted with the approval of the provincial people's government and has independent legal status.