Đồng hồ chỉ thị pha Extech 480403 2-in-1 Meter Indicates rotation direction of the motor Determine rotation of a motor without contact Ensures that motor does not get damaged from incorrect wiring 120 to 400VAC rated test range for testing phase orientation of three phase power sources over 2 to 400Hz frequency range LEDs indicate phase orientation (clockwise or counter-clockwise) and whether each of the three phases is live Durable housing is double molded Easy to open alligator clips with wide jaws Complete with cable and three large color coded alligator clips, pouch case, and 9V battery CAT III-600V; CAT IV-300V IP40 Splashproof Housing