This series of devices is used for maintenance and inspection of electrical equipment as well as finding leakage currents. The user simply clamps the device around an electric cable to detect current. Minute leakage currents to large loads can be detected, in accordance with IEC electrical safety and leakage current measurement standards. The device can be wirelessly connected to a mobile device for easy management of measurement data. Unpredictable leakage current can be monitored on mobile devices on-site.