Protect yourself and other technicians by using this simple high voltage detector to test conductive objects and within minutes, you can avoid exposure to high voltage electrical shock. In just a few seconds, with Fluke Networks high voltage detector pen a technician can determine if it’s safe to work around areas like: Transformer cases and circuit breaker housings Power ground wires or newly-driven ground rods Mobile homes, metallic siding or metal framing Pedestals, crossboxes or conduit Street light fixtures or electrical machinery. The High Voltage or Power Detector Pen is a proven life-saver, with more than 20 years of service in telecommunications outside plant and power utility applications.