The following description of the tool before the actual site survey of WLAN, which is correct? (Multiple choice)
A . Tape measure is mainly used for indoor scene obstacle test and route distance measurement.
B . Range finder is mainly used for outdoor scenes in the measurement of outdoor point imitation high, or the distance between the obstacles, the length of the hall, etc.
C . Hotspot phone can be used as a signal source and can be used for signal scanning
D . Outdoor coverage of the scene with the camera to shoot equipment installation location, covering the overall area, building structure, new obstacles and other key concerns
Answer: ABC