Abstract: In recent years, with the advantages of short cycle, simple test operation and flexibility compared with ability verification, measurement audit has been favored by laboratories. With the limitation of measurement audit project, many interdisciplinary laboratories put forward the need to add standards, which is becoming more and more obvious. How to judge whether the standard can be added is also our current important work. Taking the high and low temperature test of measurement audit project as an example, this paper summarizes the requirements for adding standards put forward by participating laboratories, and analyzes in detail whether adopting different standards has an impact on the results. I hope it will be helpful to the work of competency verification providers.

Key words: Measurement audit, High and low temperature test, Test standard, Capability verification provider (PTP)