The design of a compact, handheld, solid-state and high-sensitivity imaging probe and a micro imager system is reported. The first chamber of the apparatus further includes a collecting surface for attracting the spray droplets, a power supply, and a spray nozzle connected to the power supply for receiving fluid and producing the spray droplets therefrom. 25 inch cylindrical housing having a removable cover, the housing surrounding the valve, riser pipe, and operating rod. According to another aspect, information received on path loss from a terminal is used to determine a frequency region for the terminal based on the path loss information.