 The characterization of 2D photo detector performance is important in order to ensure compatibility with existing industrial technologies. We propose general guidelines for the characterization of these devices, including determining the detectivity, responsivity, dark current, and speed. These guidelines will help to improve the standardization of 2D photo detectors and make them more compatible with industry. This article was authored by Fang Wang, Dao Zhong, Run Zhong Xie, and others.