UNI-T UT15C Multi-function Waterproof Type Voltage Tester LED LCD Display Continuity Detector Pen Meters Tester BI183 UT15C test pen with the measurement of AC and DC voltage (contains three-phase alternating current (AC) measurements, three-phase AC phase indicator, on-off test, single pen measurement can determine the zero line and Firewire) function. Continuity test: Range 0 to 100 kOhm. The continuity LED will illuminate and buzzer will sound. LCD Voltage Display. Phase Rotation Test: 50Hz to 60Hz. Can be applied to: smelting, electronics, manufacturing, petroleum, national defense, power, chemical and other industries. Also used to solve complex problems in electronic, factory automation, power distribution and mechanical and electrical equipment.