This is an app exclusively for CEM-2400 and KESCO-2400. CEM-2300 and KESCO-2200 support firmware version 1.03 or higher. The comprehensive electrical safety measuring instrument is also used for electrical safety technology diagnostic equipment and safety inspection of communication facilities, such as various electrical safety management, electric leakage management, and electrical fire prevention. In particular, the comprehensive electrical safety measuring instrument can measure AC current,