AEMC MN251T [2132.59] AC Current Probe Model w/10 ft BNC Output. The MN251T AC Current Probe with 10 ft. BNC Output is designed to meet the most stringent demands in industry and electrical contracting, it also meets the latest safety and performance standards. The probe has a measurement range up to 240 Arms which makes it the perfect tool for measurement with DMMs, recorders, power and harmonic meters. The Model MN251T is compatible with any AC voltmeter, multimeter, or other voltage measurement instrument that is capable of displaying 1mV of output per amp of measured current, voltmeter accuracy of 0.75% or better and an input impedance of ≥ 1 Megaohms.