Check electrical outlets and detect voltage with the Milwaukee GFCI Receptacle Tester and Voltage Detector (3210-20). Designed for electrical troubleshooting and maintenance, this practical testing tool helps users check receptacle wiring conditions and identify the presence of voltage. Its versatile design makes it a useful addition to the toolbox of electricians, technicians, maintenance professionals, and DIY enthusiasts. Whether you're working on electrical installations, inspecting outlets, or performing routine maintenance, this Milwaukee tool offers a convenient solution for everyday electrical testing tasks.