MT03A Milliohm, Earth-bond and Motor Tester Kit The MT03A Milliohm & Motor Tester is a revolutionary device capable of changing the way low-resistance testing is performed. The MT03A producing highly accurate results that can automatically compensate for temperature using the included sensor, and delivers resistance testing of all windings on a 3-phase motor in under a minute. Designed to meet the needs of technicians and engineers in a wide range of industries, including automotive, off-highway, heavy-duty, industrial, marine, rail, mining, heavy equipment, and power, the MT03A is the ultimate low-resistance testing tool.