The meter is a portable, 3-1/2 digits LCD clamp meter with insulation test function(with optional 500V insulation tester unit), designed for being used by electricians, technicians, serviceman and hobbyists who need an instrument that is accurate, reliable, and always ready for usd. It is powerd by a standard 9V battery, and can provide 150-200 operating hours, which depends on the type of battery and using conditions. It has rugged structure design, good feeling held in operator's hand and convenient usd.