The MT930 is a Phase Rotation Meter that is compact and handheld that has a large LCD to indicate the phase presence and rotation. Once connected to a 3 Phase power system, the meter indicates the phase sequence by displaying its corresponding phase symbol on the LCD, as well as the rotation by arrows indicating a clockwise or anti-clockwise direction. The MT930 operates from 40VAC to 690VAC. Accessories: Set of large sized croc clips Instruction Manual Features : Large LCD Display Phase rotation indication 3-Phase Indication Checks phase sequence and open phase simultaneously Double injection rubber housing Small lightweight and portable Can check a wide range of 3-phase power source from 40V to 690V AC Large size crocodile clips