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To select Special Peak mode, press and hold then press . While in this mode the Peak flag will flash. Note: While tracing cables in any mode, keep the Receiver handle in line with the suspected cable path. See section Initial Receiver Configuration (Page 3) to set the power frequency to 50 Hz or 60 Hz. The Receiver can be tuned to locate 3 different harmonics of the chosen power frequency. H50 Hz or H60 Hz (high harmonic): Best for general locating of passive power. L50 Hz or L60 Hz (low harmoni