three old analog instruments power factor meter voltmeter and ampere isolated grey background |
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| navigate by keyword : accuracy ammeter bill black charge collection cost current dial digits display efficient electric electrical electricity electronic energy engineering equipment expense expensive factor gauge gears grid hours inductive industrial industry instrument isolated kilovars kilowatt meter power technology tool volt voltage voltmeter wattmeter white |
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| Three old analog instruments - Power factor meter, voltmeter and ampere meter isolated on grey background. |
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