Digital voltmeter with electro-optical indication of the wavefor
Display temperature compensator for electric meter
Dual loudness meter and method
Electric meter for mounting with a standard watthour meter
Electric meter with electronic rolling demand register
Electric power usage and demand reporting system
Electrical utility meter with event-triggered window for highest
Electronic thermal demand module
Electronic voltmeter
Extremal voltage detector with high input impedance
Field instrument for measurement of AC voltage fluctuations
Generator status information display for power transfer switch
High frequency current detector for a low frequency line
Integrating voltage to frequency converter and memory decoder
Key operated meter access lock and reset mechanism
Keyless unidirectional reset for cumulative demand register
Level indicating device
Level indicating system
Level indicating system
Level indicator for indication of maximum values