A handset device includes a laminated front sub-assembly and a rear housing supporting the laminated front sub-assembly. The face flange portion becomes plastered in place in a wall or ceiling with the duct portion supporting the light source and associated components. The server includes at least one pharmaceutical manufacturing and research and development numerical analysis system configured to perform different pharmaceutical manufacturing and research and development numerical analyses and generate different reports. Compared with the prior arts, the present invention is advantageous in reasonable structural design, convenient use and high imaging quality, especially satisfactory effect of focused inspection to some suspicious areas. A test program may be varied for successive runs on a computer system by employing a different randomly or pseudo-randomly generated seed for each run and preferably exercising as many features of the computer system as possible in order to search for defects in the computer system.