Clamp current Probe offers portable current measuring with 5 to 1,000A input to mA / 1A / 5A AC output and mA / 0-5V DC output. It improves both existed error in low current and error occurred by external vibration and shock as strong durability and minimized tolerance on cutting cross section of core. Main application is power analyzer, portable power meter tester and portable smart meter tester, etc.