A gas density monitoring system for high voltage gas circuit breakers. When the reception environment is the open-sky environment, an evaluation point E of each satellite set is calculated using a known evaluation method based on the number of satellites, a PDOP value, and the like. The software associates that touch with the stylus until the touch ends, or until the stylus emits a signal indicating that contact has ended. Hence, the mobile terminal is capable of operating in a dynamic and a flexible manner. The electrical safety device is a surface mounted GFCIArc Fault receptacle for converting a grounded or ungrounded electrical receptacle with limited electrocution protection into semi-permanent GFCIArc Fault protected outlet that is not easily removed. One of the members is associated with each of the upper and lower edges, and the support members are constructed to be spaced apart to support the shade in an extended, open position during use.