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Using Current Indications During Locating Both the Transmitter and Receiver will indicate cable current. These current indications will help to select a trace frequency, identify the correct cable and trouble shoot the set up. When using the direct connect method, the Transmitter output current number is displayed. A "LO" display, or number less than 50, indicates a weak tracing signal. A number higher than 70 represents a strong tracing signal. When the Receiver is used to find the cable near t