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2. Electricity meter - Wikipedia

   en.wikipedia.org/wiki/Electricity_meter

   An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device over a time interval. Electric utilities use electric meters installed at customers' premises for billing and monitoring purposes.

3. Hobbs meter - Wikipedia

   en.wikipedia.org/wiki/Hobbs_meter

   A Hobbs Meter made by General Electric about 1970. Hobbs meter is a generic trademark for devices used in aviation to measure the time that an aircraft is in use. The meters typically display hours and tenths of an hour, but there are several ways in which the meter may be activated: It can measure the time that the electrical system is on.

4. List of electrical and electronic measuring equipment

   en.wikipedia.org/wiki/List_of_electrical_and...

   Q meter: Measures Q factor of the RF circuits Tachometer: Measures speed of motors Signal analyzer: Measures both the amplitude and the modulation of a RF signal Signal generator: Generates signals for testing purposes Spectrum analyser: Displays frequency spectrum Sweep generator

5. Automatic meter reading - Wikipedia

   en.wikipedia.org/wiki/Automatic_meter_reading

   The meter transceiver and the reading transceiver both send and receive radio signals. In a one-way "bubble-up" or continuous broadcast type system, the meter transmits continuously and data is sent every few seconds. This means the reading device can be a receiver only, and the meter a transmitter only.

6. Tachometer - Wikipedia

   en.wikipedia.org/wiki/Tachometer

   A tachometer on a tractor, reading up to 3000 RPM, with the hour meter below it showing 772.9 hours. The mark at 2500 RPM is the engine speed required to run the power take-off at 540 RPM. Traffic engineering

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