AC Line Monitor/Polarity Tester

Prime Products 12-4058 Ac Line Monitor/Polarity Tester

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Item Description

Make sure you are operating your appliance within the safe operating range of 110 to 130 VAC. Easy to read digital display constantly shows outlet voltage in one volt increments. Built in tester alerts you to any polarity problems. LED display indicates if there is reversed polarity, open neutral or open ground.