What is the health certificate of Zhangjiakou City?

The health certificate is 8.5 cm long and 5.4 cm wide. Zhangjiakou City Health Certificate has my photo, information and seal, the size is 8.5 cm long and 5.4 cm wide. Zhangjiakou health certificate refers to preventive health examination certificate, which involves six diseases in five industries and protects the health of employees and clients.