The Extech 480403 motor direction and phase tester has a nominal range of 40 to 600 volts for testing the phase direction of three-phase sources over a frequency range of 2 to 400 Hz. LEDs indicate the phase direction (clockwise or anticlockwise) and which phase is live. The direction of rotation of the motor is also displayed so that it is not damaged by incorrect wiring. The scope of delivery includes cables, three large, color-coded crocodile clips, a bag and a 9 V battery.