SD9100 Pen Voltage Tester 1 year warranty, if damaged, you can replace the new product for free !! ! Sensitivity range : 90~1000 VAC Free 2 batteries Feature: Distinguish the live line and the neutral line Safe and reliable Using the switch S button, the AC voltage range is 90V~1000V. The AC voltage can be detected by touching a power outlet or using a non-contact tip to touch the live wire. Bring a flashlight for use at night or during vignetting. Breakpoint inspection, live line measurement and full line measurement. It will not work after 3 minutes and will automatically shut down when no AC voltage is detected.