DT-02 RELIFE Digital Pen Type Multimeter, DC AC Voltage Tester Smart Multi-meter Voltmeter NCV For Mobile Phone Repair Testing. This pen-type multimeter is designed for mobile phone maintenance testing, resistance measurement, diode and on-off tests, among other functions. It features a smart, convenient, and portable pen-style design with a detachable positive electrode nib for enhanced durability. Key features include a LIVE mode for neutral and live wire judgment, non-contact induction detection, and a built-in sensor for voltage alerts. It boasts a 5999 (3 5/6) digit automatic polarity display for high accuracy AC/DC voltage readings and includes LED flashlight lighting for use in dark environments.