Amprobe MO-100 [3474954] Milliohm Meter. The Amprobe MO-100 Milliohm Meter lets the user diagnose potential failure. Quickly check windings opens or shorts in motors, generators and transformers, wire-to-wire connection resistances, heating elements testing and contact resistance in critical electrical connections. The Amprobe MO-100 is a robust and compact portable milliohm meter that measures 5 Ranges from 200.0m ohms to 2000 ohms with minimum resolution of 100� Ohm. The MO100 has protection against inadvertent connection to overvoltage, a large easy to read LCD display, as well as an "O-Ring" sealed enclosure.