Signal locking will show the correct direction to a short to ground Signal distance bar indicates distance height from short to ground Led light on the receiver illuminates work space area. 10-minute shut off time Updated ergonomic housing The new Power Probe ECT3000B electrical short and open finder makes locating short and open circuits quickly and more accurately than ever before. When the ECT3000 Transmitter is connected to an isolated circuit, it will quickly determine if the circuit has an open or if the circuit is shorted to ground. The ECT3000 receiver is designed to detect the signal emitted from the transmitter, and its adjustable height sensitivity feature gives you more accuracy than ever before.