Non-Contact Voltage Tester with Adjustable Sensitivity, LED Flashlight, Buzzer Alarm, Dual Range The default measurement range: 48-1000V (AC); it can also measure 12-1000V (AC) by adjusting the sensitivity 【Live/ Neutral wire distinguish at close range】 Automatic selection of 3 kinds of sensitivity (High, Medium, Low). Non-contact voltage detection, practical and convenient way to test electrical lines