Features:[3-in-1 Multifunction Multimeter] Smart digital multimeter, electrical test pen and flashlight. Two measuring pens are easy to install and use. Widely used in electrical testing, automotive repairing, and more household/ industrial electrical problems.[Auto Recognition/ Manual Selection] High accuracy, wide measuring range, 4000 counts, auto recognition or manual selection. It can test AC voltage, DC voltage, resistance, frequency and continuity. And HT124B can also test capacitance and diode.[Electrical Test Pen] Bring the NVC part close to the conductor or use the red measuring pen (remove the black measuring pen) to contact the conductor, and it will send out an audible and visual alarm when the AC voltage is detected. It can help you recognize zero wire and live wire safely and easily.[Backlight LCD Screen & Flashlight] Clear LCD screen with backlight greatly enhances the reading experience and makes it easy to read.