[Non-Contact & Safe Voltage Tester] - Testing can be achieved without physical contact; Insulation operation ensures the safe testing; used for testing AC voltage, automatically detect the live wire or neutral wire; Intelligently identify Electric Field; In the vicinity of the object to be tested, as long as there is a voltage, the pen will give an alarming sound [Adjustable Sensitivity & Dual Range Testing] - Adjustable sensitivity makes its measurement more sensitive and flexible;The product has the dual testing range, you can adjust the sensitivity according to your needs(12-1000V AC or 48-1000V AC); Automatic Recognition of Voltage Intensity; In using, the NVC sensor of probe can automatically identify the voltage and display it on the LCD screen, simple and clear