It seems like you're asking about a topic related to "Measurement and Instrumentation" specifically related to a "Commutator Motor Meter." However, your question is a bit unclear. A "Commutator Motor Meter" doesn't appear to be a standard term in the field of measurement and instrumentation.
A commutator is a component found in direct current (DC) electric motors and generators. It is responsible for converting alternating current (AC) to direct current (DC) in the case of motors and vice versa in generators. The commutator consists of segments or bars that are connected to the ends of the armature coil windings. Brushes come in contact with the commutator, allowing the current to flow into the coil windings.
If you could provide more context or clarify your question, I'd be happy to help you with information related to measurement and instrumentation, as well as anything related to commutator motors and associated equipment.