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DMM -  Digital Multimeter. Cheap ones have 1M ohm input resistance on all voltage ranges and more expensive models usually 10 M Ohms. The accuracy isn't the visible digits. The last digit can be very misleading. An analogue meter is a different resistance on each DC Voltage scale. The "ohms per volt" applies to the full scale value. Usually much lower input resistance on DC and often on Ohms the "+" lead is negative.
- Synonyms: DVM