The HT82 model is a portable digital measuring device for determining the phase sequence by simply connecting the test leads to phases L1, L2 and L3 of a three-phase system. The large LCD display shows the “R” display for a positive test result (clockwise) and the “L” display for the opposite (counterclockwise). The measuring device also detects the presence of an incorrect cable connection or a missing phase. Power is supplied directly from the mains, so no battery is required.