Build your own Live Wire Detector for Contactless AC Voltage Detection

A contactless voltage detector could come in very handy when dealing with such situations to be sure about no presence of voltage before performing any task related to reconditioning of electrical systems.

AC Hidden Wire Detector

DIY Non Contact Voltage Tester [Tested] - ElectronicsHub

Phase detector principle and method of use

【Non-contact Voltage Tester】 Ranging 12-1000V AC, You can easily distinguish the live and null wire through different level of alarm sound and LED

Neoteck Non-Contact AC Voltage Tester Pen, AC 12-1000V, LED Flashlight, Buzzer Alarm for Live/Null Wire Judgment

DIY Non Contact Voltage Tester [Tested] - ElectronicsHub

Contactless Voltage Detector : 15 Steps (with Pictures) - Instructables

Non-Contact Voltage Tester, AC Voltage Detector Pen with Screwdrivers, Dual Range 12V-1000V/48V-1000V, Adjustable Sensitivity, LCD Screen, LED Flashlight, Alarm Mode, Live/Null Wire Judgment: : Tools & Home Improvement

Ac/ Voltage Meter Electric Small Pen Voltage Battery Tester Pen Continuity Voltage Detector Pen Non-contact Inductance - Temu

Dual Range Voltage Tester: Equipped with dual range capability, this voltage tester allow you to detect from 12 to 1000V AC or 48 to 1000V AC. Just

AVID POWER Voltage Tester, Non Contact Voltage Tester Dual Range AC 12V-1000V/48V-1000V, Electric Tester Pen with LCD Display, Buzzer Alarm&Live/Null

Contactless detection of AC currents? - Electrical Engineering Stack Exchange