The BESANTEK BST-MT299 Digital Voltage and Continuity Tester, 690V AC/DC, is an LCD type voltage tester that can measure AC and DC voltage (including the three-phase alternating current) measurement, phase of three-phase AC power indicator, on-off test, RCD test, single pen measurement, self checking, no battery detection, and other functions. It is suitable for smelting, electronics, manufacturing, defense, electric power, petroleum, and chemical industries. It can also be used to solve complex problems of electronic, factory automation, power distribution, and electrical equipment.