The DUOYI DY18 Electrical Circuit Tester is a handheld device designed to test electrical circuits, including checking for continuity, checking the polarity of the circuit, and identifying broken or frayed wires. It features an LED display and beeper, which indicates whether the circuit is complete or not, and the tester also has the ability to detect AC voltage. The compact design and easy-to-use features make it a popular choice among electricians and DIY enthusiasts.
