Dear customer:
Thank you for using the certificate query system on this website. The relevant prompts for this operation are as follows:
1. For your convenience in querying, this system can easily access the database by simply entering the certificate number.
2. Please fill in the certificate numbers in order.
3. This system is only used to verify the validity of the certificate you have queried.
4. If the certificate number is incorrect, information will not be obtained, and you will contact the staff to confirm whether this certificate comes from BTF Testing Lab.