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NT-305 Contact Voltage Tester Operation Guide 1. Appearance *If display 12 means the voltage is 9~12V. *If display 12 36 means the voltage is 12~ 36V. *If display 12 36 55 means the voltage is 36~55V. *If display 12 36 55 110 means the voltage is If the LED lights up, it means the wire is in the 55~110V and under 220V.
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