The Triplett PR450 determines correct phase wiring sequence (L1, L2, L3) for 3-phase system installations and determines contact or non-contact motor-rotation direction. Color-coded test leads are provided for connecting to the system or motor under test. LEDs display phase direction/rotation (clockwise/counter-clockwise) and which phases are live. Includes test leads with large color-coded alligator clips, carrying case, and 9V battery. CAT III-600V safety rating. 1-year warranty.