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Yes, you can use any voltmeter that fits and has correct scale. Any direct reading meter with scale from 90 to 250 volts is fine. The frequency meter uses a transducer which outputs a variable current depending on frequency. The transducer input is a nominal 120 volts from a single stator...

Careful, the terminals on the voltmeter are at output voltage when running. There is no protection so don't ground them out when measuring. The other meters use transducers or transformers for the signal and are safer to measure directly. If the voltmeter fails, use the convenience outlets...