  Mixed Reality (MR) is an evolving technology lying in the continuum spanned
by related technologies such as Virtual Reality (VR) and Augmented Reality
(AR), and creates an exciting way of interacting with people and the
environment. This technology is fast becoming a tool used by many people,
potentially improving living environments and work efficiency. Microsoft
HoloLens has played an important role in the progress of MR, from the first
generation to the second generation. In this paper, we systematically evaluate
the functions of applicable functions in HoloLens 2. These evaluations can
serve as a performance benchmark that can help people who need to use this
instrument for research or applications in the future. The detailed tests and
the performance evaluation of the different functionalities show the usability
and possible limitations of each function. We mainly divide the experiment into
the existing functions of the HoloLens 1, the new functions of the HoloLens 2,
and the use of research mode. This research results will be useful for MR
researchers who want to use HoloLens 2 as a research tool to design their own
MR applications.
