KM 071 Milliamp Process Clamp Meter is a Hand-held battery-operated clamp meter that measures 4-20 mA DC without breaking the electrical circuit. Unlike conventional clamp meters, this meter features a small jaw that is easy to reach any place there is a cable carrying with a current. This meter takes a magnetic modulated technology, it can reach excellent sensitivity with great anti-Earth Magnetic Field ability. The KM 071 Milliamp Process Clampmeter is a hand-held battery-operated Clamp Meter that measures 4-20mA DC without breaking the electrical circuit. Unlike conventional clamp meters this meter features a small jaw that is easy to reach any place, there is a cable carrying with a current. This meter takes a magnetic modulated technology, and it can reach excellent sensitivity with great anti-Earth Magnetic Field ability. With the clamp disconnected from any conductor, press the power switch to turn the meter ON. Then, might wait for about 5 seconds. A positive reading indicates the current flowing in the direction of the arrow on the clamp. A negative reading indicates the current flowing in the opposite direction of the arrow. Do not clamp more than one wire. Currents cancel and no results are returned.