It is a tool ideal for startup for entry-level electricians, hobbyists, and general household uses. The meter's non-contact voltage (NCV) detector senses AC voltage without making contact with the circuit but the built-in light flashes,which is helpful on finding the place of the line hidden in the wall etc The clamp has two jaws with strong spring can close around a conductor up to 25mm in diameter and measure current without touching or interrupting the circuit The meter automatically turns off after 10 minutes of non-use to conserve battery life and it has warning beeping before turning off It is designed according to International Electrotechnical Commission (IEC) safety standard 61010 and meets for category II installations up to 600V.