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Use these for testing phase orientation of three-phase power sources. Graphical multiline LCD indicates phase orientation (clockwise or counter-clockwise) and whether each of the three phases is live. 40 to 600VAC, 15-400Hz test range. Complete with alligator clips and soft case. Dimensions: 5.1" x 2.7" x 1.25". Weighs only 4.5 oz.