NK Technologies AMPFlasher ACI Series Current Indicator is a compact, inexpensive, easy-to-use LED ring which slips onto a conductor to give a flashing indication of current flow. 5/16" ID suitable for conductors up to 100 A & low sensitivity turn-on point detects current as low as 0.5 A with a single conductor pass. High visibility flashing LED gives visual status & compact 1" case with cable tie for secure mounting. The AMPFlasher is ideal for use in control panels, or wherever confirmation of current flow is desired. The AMPFlasher current indicators are a cost-effective way to detect live conductors and see current flow to fans, heaters, pumps, lighting or other powered devices.