... ~70Hz 3.1.6~16mm,ISO,CE,OEM ETCR1000C Phase Rotation Indicator Our buyers have stayed with us for 12years ... 1.6-ø16mmLED Display[Positive Phase Sequence]The four phase-sequence lamps blink in order (clockwise).[Negative Phase Sequence]The four phase-sequence lamps blink in order ( ... 1 Piece; Carrying case; 1 Piece. . Field Application ETCR1000C Phase Rotation Indicator --- ISO,CE,OEM services available