Circuit Breaker Finder Alert Type Sound CAT Safety Rating CAT III 750V Display Screen Type LCD Display Type Digital For Circuit Type Energized Non-Energized For Voltage Range 0 to 750V AC/DC Maximum Locating Depth 20 ft Maximum Resistance Not Applicable Operating Frequency 15.15 kHz Receiver to Transmitter Distance 21 120 ft Tracing Locations Floors Non-Metallic Conduit Walls Standards IEC 61010-1 or IEC 60664 ISO 9001 (2000) NIST