Synchroscope
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In AC electrical power systems, a synchroscope is a device that indicates the degree to which two systems are synchronized with each other.
This synchroscope was used to synchronize a factory's power plant with the utility's power grid.
Wattmeter
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The wattmeter is an instrument for measuring the electric active power in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power
Synchroscope
…Synchroscopes are electrodynamic instruments, which rely on the interaction of magnetic fields to rotate a pointer. In most types, unlike voltmeters and wattmeters, there is no restoring spring torque for the magnetically produced torques to overcome; the pointer system is free to rotate continually. Synchroscopes…
Wattmeter
Early wattmeter on display at the Historic Archive and Museum of Mining in Pachuca, Mexico
Prodigit Model 2000MU (UK version), shown in use and displaying a reading of 10 watts being consumed by the appliance
Itron OpenWay wattmeter with two-way communications for remote reading, in use by DTE Energy