Klein Tools outlet tester reliable device for diagnosing outlet faults. Its large backlit LCD displays voltage, wiring status, and GFCI trip time for 120V 3-wire outlets. A 10-second hold feature provides accurate readings for hard-to-reach outlets, and the detection system identifies faults like open neutral and ground issues. Bright green and red LEDs give clear visual feedback, while the rugged housing withstands drops from up to 6.6 feet. With precise and consistent results, this tool enhances safety and simplifies electrical troubleshooting.