Chauvin Arnoux MX 355 [MX0355Z] 400V AC /400A DC Metrix TRMS Clamp Meter. The Metrix multimeter are equipped with all the functions of a clamp meter and a full-fledged multimeter. They are the ideal tools for every electrician and electrical technician. The compact and ergonomic model MX 355 is especially designed for applications in smaller electrical installations with currents up to 400 A (homes, small craft or commercial enterprises). With the MX 355, DC currents with automatic zero adjustment can also be measured, i.e. differential measurements are possible for currents, voltages and resistances.