Prime Products 788530 Ac Voltage/Polarity Tester, Digital

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Make sure that you are operating your appliance within the safe operating range of 100 to 130 VAC. Some appliances overheat and can be damaged when operated above or below the safe range. Easy to read digital display constantly shows outlet voltage in one-volt increments. Built-in polarity check warns of potential electric shock. Also checks for open neutral or open ground and indicates correct polarity.