First sort out the instruments your company wants to measure and send them to a third-party measurement agency. After the measurement agency gives you a quotation, and you both confirm the price, you can then decide whether to send it to the measurement agency yourself or send it to the measurement agency yourself according to the type of the instrument. The metrology agency comes to provide on-site services. The metrology agency produces certificates based on the instrument data tested. The next step is to pay for the certificate. You can contact me, I do metrology, QQ: 973034741