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Fully tests incoming power for open ground, reverse polarity, high/low voltage. Three display modes. RMS voltage and frequency meter. Accurate testing and monitoring of all AC power source types. Multi-tone fault alarm. LCD display. Auto reset. Technology Research Corp AECM20020 Surge Guard Electra Check Digital Monitor
Features - Accurate testing and monitoring of all AC power source types
- RMS voltage and frequency meter
- One button operation
