Watt-hour meter with shifting screw as light load adjustment

Watt-hour socket adapter with improved electrical connections

Watt-hour testing device

Watthour meter and battery retaining apparatus therefore

Watthour meter mounting apparatus with improved electrical...

Watthour meter mounting apparatus with safety shield

Watthour meter socket adapter snap-on jaw contacts

Watthour meter socket adapter with additional plug-in...

Watthour meter socket adapter with circuit board mounts

Watthour meter socket adapter with interface connection

Watthour meter socket adapter with lockable terminal cover...

Watthour meter socket adapter with safety shield

Watthour meter voltage stator with left-right adjustment

Watthour meter with isolation transformers having a feedback...

Wattmeter

Wattmeter

Wattmeter

Wave producing and wave frequency measuring device

Wave-leakage measuring apparatus and measuring method

Waveform acquisition circuit