Review on ORIA Voltage Tester: Non Contact AC Electricity Detector with LCD Display, LED Flashlight & Batteries Included by Andre Hawkins

This tester is used to determine the presence of current in an outlet. I needed to replace an outlet in a home where the light switches were not labeled. I usually plug in the radio and turn it on, then flip the switches one at a time until the radio turns off, but without access to the radio I needed a different method. This tester worked great. It lit up red when the outlet was turned on, and then after I turned off the correct switch, the tester didn't light up. So it works as intended.