In response to ever growing demands for safer and more accurate methods of testing circuit breakers, Weis has
developed the self powered MM900 portable micro-ohm meter. It is used for measurement of resistance (µ) by
injecting a heavy current through a breaker contact or load carrying joint.
A regulated 100A continuous or pulsed current output is used for regular resistance measurement


‘Operate’ push button for 100 / 1200A pulse or 100A
continuous with stop, modes of operation (static testing).
Rotary selector switch for Off / 100A (1.999m range) /
100A (19.99m range) / 1200A (1.999m range).
LED indicators for Fault, Over Current, Battery Low and
Multipurpose accessory socket for in-car charging,
remote meter, power out, trigger in and trigger out.