检定证书 meaning in Chinese

calibration certificate

How to apply for an official certificate of completion from training courses
如何取得技术训练完毕的的参加证书检定证书？
The laboratory should keep relevant materials such as the inspection and calibration certificates
实验室应保存检定证书、校准证明等有关资料。
The air quality in sun hung kai centre is of the highest standard , earning an " excellent " indoor air quality certificate from the environmental protection department
湾仔新鸿基中心的室内空气质素达环保署订定的最高标准，获颁发室内空气质素检定证书卓越级。