Southwire's 21550T 400A AC/DC clamp meter with True RMS offers the features needed for the professional electrician, including True RMS accuracy, the ability to measure both AC and DC current, and a built-in, non-contact, AC voltage detector. Other features included are REL and max/min functions in addition to standard multimeter functions such as resistance, capacitance, continuity, temperature, and diode. This clamp meter also has a third-hand test probe holder and a bright LED work light. The 21550T is built to last and is guaranteed to survive a six-foot drop.